Question about 1990 Chevrolet Astro Extended

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1990 Chevrolet Astro, 4.3L TBI, runs smooth until it heats up, then acts as if it has a miss, and runs rough. It appears one of the throttle body injectors is not spraying fuel when it's running rough. I replaced both the TBI injectors, and the ignition coil, and still no change in how it runs. Any ideas would be appreciated.

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Chk. your egr. valve and see if its functioning, sometimes it gets a carbon buildup in the intake where it bolts on and also in the valve itself. Take it off and clean the valve with carb. cleaner and also clean out the intake with a screwdriver and shopvac, and make sure the valve works before you reinstall it, and also get a screaned gasget at your local auto parts store before you reinstall it in case you miss some particals in the intake it will insure that no particals will get into the egr valve.

Posted on Sep 07, 2009

Testimonial: "EGR was clogged. Thank You."

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