1987 chevvy 3/4 ton 4x4 350 throttle body shakes and i was low on gas tried putting gas and tried to start it and it wouldnt start changed plugs, egi valve, fuell filter, pick up coil and it jus back fires threw the intake im stumped

SOURCE: 1988 gmc k1500 wont start

hi, check the connections at the ecm,i think it's under pass front seat,i've had a couple of those years loose injector signal at ecm connector,if you have a test light you can unplug injectors and test across terminals ,it's a 12v signal at inj ,if lights flash on both while cranking try plugging in one at a time and see if either sprays, if one does and not the other, you would have a shorted injector

SOURCE: My 1995 Buick Lesabre is misfiring

If it only happens at a certain point in the throttle travel, it may be a bad TPS. You would need a computer to confirm loss of signal, but that is what it sounds like.

SOURCE: no power

Sounds like a rocker arm may have come loose. An exhaust valve is not opening for some reason. You can remove the valve covers and watch the rockers. One is likely to be just laying in there (hopefully), or the cam lobe may be wiped out.

SOURCE: 1987 chevy s10 pick up

Go back to basics and do a complete fuel system and compression test, if it hasn't had a full tune-up in a while you may consider that also.

SOURCE: i have a 1992 gmc

CHECK FOR VACUUM LEAKS AT THROTTLE BODY GASKET,REPLACE FUEL FILTER FIRST THEN CHECK FUEL PRESSURE SHOULD BE 9 - 13 PSI. LEAN FUEL MIXTURE WILL MAKE VECHICLE BACK FIRE,IGNITION TIMING OFF, OR BAD STICKING VALVES,FAULTY FUEL INJECTOR CAUSE ENGINE BOG DOWN BACK FIRE.