Good day everyone. I have been working on an 87 f150 with a 302 and a 4 speed manual transmission that has been sitting for around 6 years. The PO had parked the truck after putting the wrong fuel pump relay in and burning out both the front tank and high pressure fuel pumps. When I got the truck, I replaced both these fuel pumps and the fuel filter, the fuel lines, bypassed the dual function reservoir (as it was bad), and dropped/cleaned the tanks. I also purged the old gas in the fuel rail and put in a bottle of injector cleaner, and did an oil change. At this point, I attempted to fire her up, she fired rite up and was idling about 700rpm. After a few minutes, when the truck warmed up, it began to surge and bit and wants to die. if I let off the gas or floor it, the truck dies. if i pump the gas then it will stay running and start backfiring and makes a sparse/random pinging sound from the drivers side rear of the engine.
So far, the IACV has been pulled and cleaned.
new rotor button, cap, wires, and plugs
ran seafoam thru the intake
checked for any air-obstructions in the air filter housing/hoses
double checked the timing W/O the spout plug
I have also tried to pull the codes, the CEL light will stay lit as long as the key is in the On positon with the jumper between STI and SIG-RTN (I have used this method to dump codes on Explorers without any problems)
idles fine around 700rpm when cold, then dies off when warm
when still cold, if given any gas the engine will rev after hesistating
once warm, the engine will die if any gas is given OR will stay running and backfire/ping if gas is pumped (crossfire maybe?)
I figure I should check the ECT and EGR system.... as these both would cause issues as the engine warms up. I also plan on checking/cleaning grounds.I would like to know if there is anything else I should check on as well and get any input on these problems.
thanks in advance