So recently I put a new set of spark plugs in my engine. Now every time I put the car in drive or reverse you hear a thumping suction noise. What it sounds like to me is its coming from a cylinder. The noise sounds like it's suction from a piston. This is because you hear the sound for a short moment like it's combusting and gets quiet and then you hear the sucking again. It's only coming from the right side of the engine (passenger side). I check the gapping on the spark plugs and it seems to always be gapped correctly. No check engine
light has come on, I don't know if that's because of the engine tune. I'm assuming if the engine still had a problem, the check engine light would still come on regardless if it has an engine tune or not. Does anybody know what the problem is?
Sent from my iPad using Mustang Evolution