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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15930
Experience:  Have owned a repair shop for 25 yrs.
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Chevrolet Blazer 4x4 (Mid Size): I have a 2000 blazer 4.3

Customer Question

hi I have a 2000 blazer 4.3 I was driving yesterday on the expressway and every so often the motor would start to feel rough almost like a misfire and I would get a bad smell from the exhaust and the engine light would continue to flash. this happened in the past and it would pretty much immediately clear up and run smooth this time it didnt i had a computer put on it recently and it said a misfire possibly the maf sensor or the cat conv. when I exited and slowed down it was running real rough almost like it was going to stall but it didn't it was jumping between 400 and 600 rpms I changed the plugs and cleaned the maf and unplugged it while it was running and it didn't change I sprayed the wires with water while it was running but didn't see any spark anywhere so I think they are fine so I am not sure where to look next
Submitted: 2 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 2 years ago.
Hi,My name is Tim,
I will do my best to assist you
i know you have already replaced the plugs,but,do a complete tune up,replace the distributer cap,rotor and the plug wires,,always do a complete tune up all at once,any of these ignition parts can give a fit and there is no good way to test them.
with that being said,if it continues after the tune up,the flashing engine light happens because of a continuous missfire,,most times from the tune up,but can be caused by a clogged catalyst converter..
have a mufler shop to test the catalyst
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