89 c-1500 with 4.3 won't stay running?

ok the truck will start but the only way to keep it running is to pump the gas, but when i hold the gas the motor will bog down until i let up on the gas then it dyes if i don't keep pumping it. i put in new intake gaskets, new vacuum lines i replaced : TPS, MAP, idle air control valve, new gaskets in the TBI, pick up coil, ignition control module, cap, rotor, wires, plugs, EGR solenoid, cleaned the EGR valve, knock sensor, engine coolant temp sensor, all filters, and the ECM. the only things i haven't replaced are: electronic spark control module( still factory one) , fuel pump. when i replaced the intake gaskets and put the timing back to 0 degree BTDC and then plugged in the timing bypass wire, the truck ran awesome.then two days after, i stopped at a stop light when taking off from the stop it started to surge and hesitate, so i dropped the gas tank to put a new strainer in, i also took the TBI off to put new gaskets in and screens for the injectors. After i did that i started to have the problem i told u about . i get no SES light. i also took every ground wire off and clean them. i have no idea what to do now. new truck is out of the question.


PLEASE HELP|||Wow you've been shooting in the dark, did you ever check your fuel pressure? Do that first. Your fuel pressure regulator may be your problem, if it is stuck open you want have enough fuel pressure. Also check your fuel pump relay, just in case, usually they will not start are vary hard to start if the relay goes bad, they are designed to work on a bypass circuit when a specified oil pressure is reached, once started they will run but not necessarily very well. One more thing, has the setting on you tps moved, make sure it is set correctly. Have you got good exhaust flow, if not a clogged cat could be the cause, if your blowing black smoke your too rich which goes back to fuel pressure or injectors. make sure you have everything connected properly a once more over won't hurt.|||just for s's and g's i would look at the egr valve again. make sure you didn't loosen something up (while cleaning) that came loose two days later and is sticking the valve open. good luck!