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Discussion Starter · #1 ·
my pontiac with 3.4 engine has a miss at idle and smells rich. yet you pull a plug and it looks lean. replaced o2 and cleaned egr. has new plugs, wires,timing belt, air cleaner. runs great at speed.
has 120,000 on clock?
 

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I'm no pro, but my 91 chev had similar symptoms which was corrected with a new fuel pump and fuel filter....I don't know if this will help, but may be worth checking anyway. The code the ECU was giving me was for O2 sensor....
 
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