My engine had been stumbling occasionally at idle for a split second here and there. Sometimes when taking off it would stumble for a second but then catch itself and be fine. Today I changed the spark plugs to see if that would help and it's much worse, barley drivable with misfiring. During that first drive after the spark plugs I also started having radio trouble. I have an aftermarket Pioneer head unit that stopped playing and reads "AMP ERROR."
As I was taking off for the first drive after changing the plugs I checked the codes and initially I had P0421 P0544 and P0660 but then P0302 popped up a few seconds later. No check engine light.
Not sure what I should do first. I read the P0660 could be harness or PCM related, so do you think the radio issue is related to that? Really don't want to dump a bunch of money into this car
P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0544 - System Gross Leak Evaporative Emission
P0660 - Intake Manifold Tuning Valve Control Circuit Open Bank 1
P0302 - Cylinder #2 Misfire
As I was taking off for the first drive after changing the plugs I checked the codes and initially I had P0421 P0544 and P0660 but then P0302 popped up a few seconds later. No check engine light.
Not sure what I should do first. I read the P0660 could be harness or PCM related, so do you think the radio issue is related to that? Really don't want to dump a bunch of money into this car
P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0544 - System Gross Leak Evaporative Emission
P0660 - Intake Manifold Tuning Valve Control Circuit Open Bank 1
P0302 - Cylinder #2 Misfire
