My truck is having an issue. When I start the engine, the rpm's rise up to about 900 and then drop to about 400, back up to 800, down to 400 and then steadies off at about 800.
Also when I'm driving, when I let off the gas, the rpm's dive to like 300 and rise back up, or the truck just stalls out completely.
I'm at a loss here, it's gotta be something within the fuel system. I also did a full tune up two weeks ago.
I am also getting the worst gas mileage I've ever had in this truck.
Appreciate the help