I did a complete tuneup including wires And fuel pump
You still have to check fuel pressure making sure your filter is good and pressure regulator and return fuel line clear from clogging also making sure your tps sensor commending advance timing and fuel at the same time
SOURCE: 91chevy caprice hesitation
could be a vacuum leak, also get rid of the quadrajunk carb it will prolly help
SOURCE: 87 CHEVY BLAZER, FUEL PUMP NOT GETTING POWER
It's your Electronic Control Module (ECM). There is a short in the computer. You're going to have to replace it. The same symptoms occurred in my vehicle, had a mobile mechanic come to my house and fix the problem. Quoted me $350 for parts (used) and labor.
SOURCE: no power tp the fuel pump, injectors not pulsing, no fuel.
Check out your oil sending unit, fuel pump and relay, check for power (might be a fuse), the ignition control module (which if you remove it, can be tested for free at AUTO-ZONE), any related wiring, pick-up coil (inside the distributor), and possibly the ignition switch. If I can be any more help just as away.
SOURCE: surging power lose
a maf sensor will cause this also,you can go to any auto parts store and buy the maf sensor spray. follow directions on can. make sure air filter is clean also. my car did the same thing and after I cleaned the maf sensor it has been fine. 3.1 engine, to check sensor, just unplug it and try it on hills or highway. the car will not run very good and may stall out, but if the car does not surge, the maf is the problem.
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