Got an 02 Impreza and I’ve been having all four cylinders misfire. Changed my coil packs spark plugs. Come to find out, it’s my lightweight flywheel throwing off the ecu. But at the same time, I’ve got a super low idle and car shuts off from time to time. Could that be compression? Gotta take it to bar and ref cause it got flagged during a smog on Friday. But I’m lost with the misfires.