Hello all,

the truck starts fine when cold, and starts fine when warm but acts really pissed with any throttle input when warm. I have excessive tank pressure which I suspected was rust in fuel lines so I ran a soft line with -AN adapters to the rail with no change. So much so that I get gas in the charcoal canister if the vent is connected. Which is.. weird. So that may be a separate or connected problem. It ran fine for several thousand miles after new fuel system and other maintenance listed below.

Have experienced issues with and without the tps connected.

what I’ve already done:

Replaced full fuel system (new injectors, tank, pump junkyard fpr, filter)
new radiator/oem tstat
new plugs, coil, wires
deleted egr valve
bypassed aux air valve
Replaced cold start injector (plugged/unplugged when engine is warm also)

addt’l troubleshooting:

new temp sensor (near Tstat)
checked/replaced vac lines with silicon lines
checked Intake tubing for cracks
checked both flapper valve and tps with dmm
tuned, replaced and quadruple checked tps


I don’t think I’m missing a vac leak, or screwing up the tps calibration but anything is possible. I also don’t think I got two bad FPR (my stock one and the junkyard one) and am looking for some more suggestions on what to check that I either missed on the list or may have done incorrectly. Truck ran fine for several thousand miles with new tank/pump etc.

thanks in advance!!