1990 Nissan Truck Not at full power

1990 NISSAN TRUCK
15,000 MILES • 4 CYL • 4WD • MANUAL
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LOAF22
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It feels like its not hitting on all cylinders. The engine is shaking at idle and you can just here it missing. Sometimes when I drive it down the road it will kick in and have full power. I have changed the distributor cap and rotar, new plugs and wires. I dont know what else it could be, any help would be appreciated.
Jan 8, 2010 at 10:20 PM
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RASMATAZ
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Check and test the IACV/AAC valve and PCV and EGR valves and TPS and Airflow meter.
Jan 8, 2010 at 10:37 PM
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LOAF22
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[quote:7d12424eed="rasmataz"]Check and test the IACV/AAC valve and PCV and EGR valves and TPS and Airflow meter.[/quote:7d12424eed]Thanks rasmataz I tested the vavles you told me to and they all checked out ok. I had a guy tell me that it might be a "weak coil" could this a possibility?
Jan 10, 2010 at 9:22 AM
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RASMATAZ
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Could be the coil-check the coil's primary and secondary resistances and also the distributor pick-up coil and for a vacuum leak
Jan 10, 2010 at 3:34 PM
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LOAF22
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[quote:fcb518b785="rasmataz671"]Could be the coil-check the coil's primary and secondary resistances and also the distributor pick-up coil and for a vacuum leak[/quote:fcb518b785]

Thanks rasmataz, I checked the coil and it was ok. I believe that I have found the problem. I checked the compression and heres what I found
cylinder #1 70lbs
cylinder #2 70lbs
cylinder #3 70lbs
cylinder #4 110lbs
Standard is 192lbs
Minimum is 142lbs
By the way this is a Four cylinder KA24E engine. Now I guess my next question is what would be some possible causes for this, and what would be my next step/s? Thanks
Jan 13, 2010 at 4:58 PM