hello i have a 94 325is with a dinan chip and cosmos racing CAI and ym car still feels a little sluggish sometimes it rips hard and most of the time its feels a little sluggish what could cause this? car has 135,000
vanos solenoid possibly... vaccum leak somewhere.. O2 sensor on its way out.. fouled spark plugs.. it could be a wide variety of things unfortunately. Luckily these are all cheap solutions. Vanos solenoid and spark plugs i would start with.
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