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  #1  
Old 11-02-2011, 01:03 AM
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long story short....truck was perfect one day then took it to my dads friends shop to get a couple things replaced, then the next day i got it back it started to back fire.... have asked several people on what to do and no one seems to know....
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Old 11-02-2011, 03:13 AM
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what was done to it at the shop?
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Old 11-02-2011, 10:06 AM
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Yeah more info, what was done?
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Old 11-02-2011, 04:16 PM
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had the spark plugs, wires, cap and rotor replaced by my dads friend who owns a shop, got my truck back and started the back firin when im tryin to keep at a constant speed. took my truck to my friends dads shop he said that they have the wrong plugs in it (platnum champians). so i went and bought original spark plugs(copper risisters) and replaced them all. it started to go away when i test drove it that night, but next day went back to back firin.
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Old 11-02-2011, 04:29 PM
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Sounds almost certainly like it is a distributor/wires/plugs problem, so that makes sense. There's a bunch of things that could be wrong:

Wrong plugs
Wrong gap
Loose connection of plug to wire or wire to distributor cap
Cracked distributor cap
Rotor installed backwards(not sure if this is possible, been so long since I've touched one)
Wires got mixed up and firing order is off
Bad wires.

I'd start by checking the firing order and where the wires go and make sure they are located correctly, and that all connections are good. Then check plug gap. Also check for obvious things like rotor installed correctly, cap not cracked and is tight, etc...

EDIT: Also, does it only do it at low rpm? Could be a slightly loose plug, make sure they are all snug.
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Old 11-02-2011, 04:32 PM
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Also, use the oem plug, not some other plug, my experience is that things almost always run better with oem plugs...
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Old 11-02-2011, 07:21 PM
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well i know i have the right plugs and that the gap is right, and im pretty sure i snugged them good doesnt hurt to double check. maybe the guy put mixed up the wires....how do you figure out which wire goes where?
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Old 11-02-2011, 07:29 PM
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also....when the guy replaced all that and after i figured out that my truck was back firin i turned around and took and back to him and he double checked everythin and said that the reason that it could be back firin is because when he replaced the spark plugs the old ones were corrodedand when he put new ones in the truck got better connection and that the back fire has probably been there the whole time and i probably didnt notice it....i dont believe it was ever back firin it ran pretty good before i took it to him ..... also when my truck does back fire it also shakes a little be. and it starts to do it when im goin bout 40 or higher...but doesnt start doin it till the truck warms up
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Old 11-02-2011, 08:56 PM
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Yeah he's full of it....I'll try to find a diagram for your engine so you can double check the wires....

Are you using an oem type plug?
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Old 11-02-2011, 09:08 PM
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Here, you can check the wires are correct with this:



If that's good, then I'd do this:

Check the firing order. Unplug the coil, remove the number one plug, stick your finger in the hole, have someone click the engine over in short bursts until the number one piston is at the top (it will blow your finger out of the hole as its coming up). Line up the timing mark on zero at the front pulley and remove the distributor cap and see if the rotor is pointing at the number one plug. Verify firing order is 1-8-4-3-6-5-7-2
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