Q: Idle issue
Hey just had a quick question I have a 2002 Honda civic automatic 1.7L and so I had a question earlier regarding that when I turn it on it would kind of rumble so I seen a hairline crack in the exhaust manifold which i got patches up pretty nice but then it still was the same so I let the car idle and pulled out each ignition coil one by one and there's 4 altogether and so I pulled 3/4 and the Rpm went down as.it should right? And then one of them when I pulled out it didn't.make a difference in the Rpm so then I switched two ignition coil and the problem stayed in the same cylinder could that mean I have a bad spark plug that needs to be replaced?
My car has 290000 miles.
My car has an automatic transmission.
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