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Jehannum
 
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Your coolant temp sender or fuel temp sender has gone, you've filled the cat with shit, and it's going to run badly until you replace both (or all 3). Probably wouldn't hurt to swap the oxygen sensors either. I would probably plug a diagnostic computer in to see what the various sensor readings are and diagnose based on that.

Mixture wouldn't be affected by spark plugs, unless they're worn down to nubbins, and it definitely wouldn't be affected by timing unless you're way, WAY out.
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1992 300ZX: Not stock, 433 RWHP
1971 240Z: Toyota front brakes, 123 RWHP
1967 Pontiac GTO: not stock.
Old 10-20-2017, 06:46 AM Jehannum is offline  
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