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Mr_Wrench, ASE Certified Technician
Category: Chevy
Satisfied Customers: 395
Experience:  24yr gm Drivability & Electrical
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2002 chevy s10 blazer: spark plug rough..drives..stalls

Resolved Question:

2002 chevy s10 blazer 4.3 a multiple random misfire code was pending ... any suggestions of order to replace things truck had caprotor spark plugs spark plug wires changed 20000 miles ago at 60000 milestruck seems to mildly run rough but drives good never stalls ididnt realize it is 1:55am there i will check for an answer at 8:00am thank you sorry for the delay to accept or ask question...
Submitted: 8 years ago.
Category: Chevy
Expert:  Mr_Wrench replied 8 years ago.

Hello Jeff !

Have you cleaned the fuel injectors? If you have a slight misfire that hasn't turned the service engine light on yet you possible just have a few lean injectors, Also I would clean the mass air flow sensor with a mild injector spray cleaner. Spray the small wires off inside the sensor. That is the best place to start on this kind of problem. Also have you changed the fuel filter? possible needed it will cause a lean condition. Hope this helps.

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