Re: COIL pack / Engine shudder at High RPM questions?? - Saab 9-3SS Bulletin Board - Saabnet.com
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First make sure the engine have correct spark plugs. NGK PFR6D-10G.
A customer of mine picked up a pristine 9-3 in Texas that had been serviced just before, and they had installed the V6 spark plugs instead of the 4 cyl. Along the way, those taller spark plugs burned a hole in a piston and he needed a new engine.
Worn inner drive shaft joints can also create a shudder during acceleration.
A failing fuel pump can deliver too little of fuel during hard accelerations and create misfires. This is more common on the V6 though.
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