I recently bought the car from a retired lady. She had the plugs replaced at 42,000 about a year ago but not the wires. Today I put in some of that Techron additive and filled the tank with premium gas. The tachometer does not fluctuate when the engine "misses." I will try replacing the fuel filter and see what that does and also let the Techron additive to its thing. Thanks for the advice - I will keep you posted on the outcome.