1993 Chevy Cheyenne Truck idling rough

1993 CHEVROLET CHEYENNE
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NICKPARSON
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Engine Mechanical problem
1993 Chevy Cheyenne V8 Two Wheel Drive Automatic

Recently I replaced the valve cover gaskets on my truck and while I was in there i felt of the rockers and adjusted one that was making a tapping noise (i tightened it a little). When I first ran it up and drove, it ran with no problems, but today when I started up the truck it was idling very rough eventually it went like rum rum and then made a puff sound and ran smooth. THen I started it up again later on and it was just idling very rough and I didn't try to take off in it. It was like it was just constantly misfiring. I know I put every thing back together right (I think). Its a 93 chevy c1500 chevy 350 5.7. Could tightening the rocker that small amount really screw it up that much?

The motor was rebult 2 years ago
Feb 28, 2010 at 9:11 PM
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LEGITIMATE007
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no i dont think so, I would check all of the vacuum hoses and the air intake for restriction.
Feb 28, 2010 at 10:46 PM