I'm a qualified Hyundai tech but sounds like a cam sensor/ crank sensor issue.
Is the check engine light on?
Yes the light is on, they put a header on it previously with no o2 sensor spot so I got the tech to put one in, the light was off for about 3 miles then come back on, the guys at advanced hooked it up and said it was the tps or the mas so I replaced both and that's when the cilinders quit firing. Thanks ill try it.
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SOURCE: 1999 pontiac grand prix . will not run
If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
See http://www.greatautohelp.com
SOURCE: 91 LEGACY STARTED RUNNING ROUGH
The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.
SOURCE: Overheating, Miss Firing, and Running Rough
Smell the coolant. Is there any hint of gas smell? Also look at oil, any coffee coloring indicates problems.
SOURCE: 2000 gmc jimmy was running rough i was told it was
none of that will fix a pluged cat the only way to fix a pluged cat is to replace it
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