1991 Pontiac Lemans

Engine Performance problem
1991 Pontiac Lemans 4 cyl Front Wheel Drive

I have a 91 Pontiac Lemans le. It has had a recent tune up, and fuel filter replacement, after which it developed a no start condition. We checked for fuel it has fuel to the throttle body but no iector pulse.
It had pulse but no spray from the injector so we replaced the injector, now nothing. We had the ignition module tested and it's good. I could use some help.
August 22, 2010.

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