Question about 1998 Chevrolet K1500

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Truck tends to run rough in damp weather

I have a 98 Chevy Truck 5.7L, I've noticed lately that it runs rough and there is a loss of power. It seems to run the roughest around 1800 RPM and above. It seems that it happens most frequently in wet weather. The truck had a tune up around a year ago and all the spark plugs were replaced. Just recently all the wires were replaced as well as the fuel filter changed and the fuel pump tested. The truck has around 215K miles on it and still runs great, except for this. Any suggestions?

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I have the same year of truck you do. Had the same exact problem. In the morning it ran rough but in the afternoon it ran great. Moisture was getting into the distributor cap. I pulled the cap and it looked like it was firing all over the place. Put a new cap on and it runs perfect. Hope this helps. James

Posted on Dec 23, 2012

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I think you have a cracked distributor cap that is alowing the moisture to get inside of it. i would replace the cap. you can test this but beware if it is the cap the car will not start until all the moisture is dryed out of it. start the vehicle and spray just a fine spray of water on the cap if the vehicle acts up it is your cap or possible a plug wire

Posted on Apr 14, 2009

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