Question about Cars & Trucks
Yes it can, at least on my 97 saturn SL2.
You can remove the EGR value and check for carbon built-up.
The carbon can build up on the intake valves and cause misfires.
The carbon lowers the octane level of the gas and also partly burns some of the fuel.
How I do a valve cleaning:
Posted on Jun 06, 2014
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Posted on Jan 02, 2017
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