Kinda like the title says my 03 MSP is SUPER SLOW!!! There is no check engine light. However I have gotten a P0300 code recently ( multiple cylinder misfire). So far I replaced the coil packs and had the ECM updated by the dealer. The car still is super slow, feels like something is dragging is back. I am a mechanic and follow digestions instructions well. Iv been all over the forums but can't seem to find anyone with the same problem.
Recap: No check engine light, New coil packs and spark plugs, ECM updated.
Recap: No check engine light, New coil packs and spark plugs, ECM updated.