1990 chevy c1500 4.3L needs help
 

truck has intermittent idle, surge, cuts out after driving a few miles. The truck sat for a year so we had he heads rebuilt. it ha almost 200,000 miles on it. we replaced the O2 sensor, idle air control valve, plugs, wires, cap, rotor, pickup coil, fuel filter. the fuel pump has atleast 140,000 on it, maybe it's going out??? any ideas?

Acts like crappy gas.

ive put some new gas in but never used up all of the old gas though

very possible pump is shot. old gas can leave a gummy film on stuff, known as tarnishing. fairly inexpensive and fairly easy to replace. worst case, if ya replace and it don't fix, then you'll know it ain't the pump. :D