i just bought a 1997 f150 with a rebuilt motor by napa 10k miles ago. during the firts ten minutes the truck runs rough. if i give it gas it will soon stall after stumbling for second. also when at a low speed if i give it gas it misfires for a bit ten i give it more gas and then it just stops missfiring. and the truck runs fine.

i have replaced my plugs and wires which makes it run better but also no codes except the second o2 sensor is showing. i have yet to test the ignition coil pack at oreily's.

my question is, if it is not the ignition control module pack what else should i try. te IAC and TP sensor? i have read other posts but thought i would ask for my engine specific.

any info would be appreciated.

 

seems like you got maybe more than 1 gremlin.

did you get all new sensors too, with the rebuilt engine?

I'd start by cleaning the IAC....then check the coolant sensor.

maybe you over looked a ground wire or a vacuum line when reinstalling the engine.

 

i bought the truck with the rebuilt motor installed. the guy i bought it from had paper work on the motor rebuilt. ill clean the iac sensor tonight and check the vacuum hoses.

autozone is only 17 bucks for the coolant temp sensor. ill try that this week