Hey Guys,I Have a 1997 f150 with the 4.2 v6. It's drives fine when you're not hard on it, but if you need to go it has a hard time reving. It usually has to shift all the way down to first. Can't get it to rev well in second even when accelerating from a stop. Here's what I had done in relation to this issue. I did a complete tune-up on the engine. New oil, oil filter, new plugs, new wires, new coil pack. Also put in a new air intake, air filter, and MAF sensor. About a month ago I tore it down the intake cleaned it and put new clips on the IMRC linkages. I also tested the actuators for leaks and found them to hold vacuum well. Put it back together with new gaskets and also put in new fuel injectors. I cleaned the throttle body and replaced the 02 sensors. I also had my mechanic replace the fuel filter and fuel pump. I am kinda lost any advice would be great! Suspecting a cam position sensor?

 

All of the sins of the first time poster. Tsk tsk. At least you were on the right track, you picked a more specific forum. Good luck.

https://www.f150forum.com/f2/f150-4-...9/#post7043275

 

Time to have a look at operating data with a Scanner and test fuel pressure and know what your looing at.
Are you sure the plug wires are on in the correct fire order?
Best I can offer at this time.

 

Yes sir, I did check the wires the other day and that helped a little. It stalled out on me a couple times yesterday, so I'm going to have my mechanic look at it. Thanks.