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Comment: Check Engine Light On
June 15, 2017, 12:18 PM
I have a 2007 ford f-150 XL with a 4.2 L engine. I had it tuned with new coils and plugs. The check engine light is still on. I can drive it and it is fine but sometimes when I have to come to s stop at a light it will stall out. It will start up ok but will stall out again usually at another stop. The exhaust sounds like it has back pressure when I gun it. Do I need a new muffler to eliminate the back pressure issue? Or is it something else?