I buy gasoline that contains ethanol however, I add Gum Out All In One system cleaner at every fill-up. This car came with no service records so I am thinking of doing a compression check, replacing the spark plugs and doing an oil change. I may check the cylinder temperatures using a temp gun. any other ideas as to why the engine is running rough and/or missing?


It seems when I accelerate fairly rapidly up to 40 miles per hour, the engine stops missing at speed above 40 miles per hour but that may be my imagination.....