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Old 01-12-2018, 08:32 PM   #1
tahoedriver
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Rough idle and misfire

Got a 97 Tahoe with 280k miles on it and its running and idling rough. I've changed the plugs, cap, and rotor two days ago. My suspicions are a dirty MAF and/or ignition coil (which is stock). Any suggestions or thoughts would be appreciated. Thanks.
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Old 01-12-2018, 09:01 PM   #2
Tech II
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Re: Rough idle and misfire

Well, when you replaced your plugs, did they all look the same, or were some more fouled than others? Did you change the plug wires too? Use OEM plugs?

Well, I would put a spark tester on the end of each wire, one at a time, just make sure you have a healthy spark to each plug.....

Other possibilities are compression problems in a cylinder(s), bad bearing in the distributor, bad injector, vac leak, etc.

Have you scanned for codes?
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Old 01-14-2018, 07:49 AM   #3
j cAT
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Re: Rough idle and misfire

[quote=tahoedriver;7207158]Got a 97 Tahoe with 280k miles on it and its running and idling rough. I've changed the plugs, cap, and rotor two days ago. My suspicions are a dirty MAF and/or ignition coil (which is stock). Any suggestions or thoughts would be appreciated. Thanks.[quote]




ZZZZZZZZZZZZ




maf does not cause rough idle . causes a delayed power of engine. fuel pressures should be checked. distributor rotor will wobble on these if over 175K miles. if plugs looked good a light color then compression should be good .. the injectors are a problem on these at this age also rough idle . pcv and all the vacuum lines should be replaced with any defects ..
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