Zac Johnson

Well I tested the tps and it checked out, I also replaced the VSS. I ensured the fuel filter was installed correctly and that it wasn't leaking. I am getting spark to all 8 cylinders and I'm not getting any fault codes other than an egr code which seems to Be standard with this year model and a code for coolant being to hot or to cold. It only dies when a load is applied, I.e. Putting truck in gear. I noticed it doesn't die if I smash the gas versus gradually putting pressure like you're supposed to drive. Any more ideas fellas And ladies?
my next course of action is going to Be dropping the tranny pan and checking the filter and TCC solenoid situation

Zac Johnson

Yeah so a little bit of an update, the problem is way worse when you take the intake hoses off the throttle body. It'll even die in park after hitting the throttle

BLDTruth

Have you ever replaced your vacuum lines?

A faulty vacuum system, especially to the fpr or egr can cause all kinds of problems. And it might explain your 334 code.

Zac Johnson

So my problem persists. I have now replaced my map and ignition coil. When I hit the gas the truck revs up fine but when the gas pedal is released the truck can't catch itself, the rpms will catch for a second around 800 rpms and then slowly go down until the truck dies. It doesn't just sputter and die, it's weird the rpms just slowly go down until it hits zero. It idles really strong though, there isn't a problem until the gas pedal is hit. I went through all the vacuum lines and sprayed them with starter fluid checking for a possible vacuum leak but could not find one.

Tim Thomas

Just curious if you ever fixed the issue? I recently bought a 94 F150, 5.8 and it started doing the exact same thing..

2dwoods

I have a 95 and just had similar issue I could idle but if you stomped it it stumbled if I put it in gear and gassed it it would die ,ign.control module on fender I had a spare plugged it in and bang problem fixed I thought fuel at first cause how it acted.