I have a 98 chevy 1500 4.3L vortec I've pulled off all the wires and checked for a spark all but #5 sparks i changed the wire set and have the same problem. the truck starts and idels fine but try to accelerate and the engine shakes and misfires badly.
These have a real problem with the distributor caps, i would try that
Check you FUEL INJECTION HOUSING.....not the individual injector.
The factory housing is probably the OLD style that will crack INTERNALLY. When this happens, it sprays fuel into the neighboring cylinders causing firing problems. The OLD style will have the INJECTORS AT THE HOUSING with tubes running to the engine. The NEW style has wires running from the housing to the INJECTORS AT THE ENGINE.
If you've run into a wall trying to fix you misfire problem, then this is probably the culprit. The crack is not visible as it is INTERNAL. The first guy to work on my 97 Silverado replaced my #6 injector for $300. My new mechanic can get the entire housing with all 8 injectors for about $390. Prior to this, we replaced plugs, wires, Idle arm control, throttle positioning sensor, #6 cylinder and the first guy adjusted the idle with a screw driver which created more problems not to mention he didn't clean the intake while it was off nor did he replace the "reuseable gasket" that was obviously wore flat.
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I have the same problem . 1 & 2 misfires compression is 175lbs. new plugs, wires, cap and rotor.
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