Did a routine plug change (AL103 at .045") and replaced with same plug at .050" per advice of a buddy who has 400+ hp gtx. Now the car runs like complete crap, bad idle and surge. The car bogs out under boost. What range plug should I run and what gap?

3.0 pulley
headers
xp cam
cat back exhaust. etc.
ZZP tune.

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2000 Navy Blue Metallic GTP-old and slow. (xp cam/3.0 pulley/ssic/pacesetters/Flowmasters/SSC Springs/ h.id.s/18'' Konig Wheels)

If it ran good with the AL103 at .045 gap then try that. How are the plug wires? It's possible you messed up a wire when you removed them to replace the plugs.

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Bright Red 2008 G8 GT

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