running rough

1006 Views 4 Replies 3 Participants Last post by  lilbully
Here is my confusion..... I put a 5.2l in my dodge ram that had a 5.9 in it but now if I have all the vacuum lines hooked up it dies out like the rpm gauge drops and when i disconnect any of the vacuum lines it runs better a little rough but doesn't die out. When I hit the gas it revs up without hesitating at all and drives fine only when I let it get back down to idle in 1st gear or in reverse when stopped it dies. It is getting better since I ran it for a bit and kept hitting the gas to keep it running but is still dieing when you just let it sit can someone explain to me what is going on....
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Sounds like it needs to relearn the idle strategy. I may be wrong, but I think if you connect up all the vacuum lines, start it, and keep it running for about 10min to let the computer relearn the idle, you'll be good to go. Double check with one of the techs on the site and correct me if I am wrong.
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