I drive a 99 Mustang...3.8...no mods...just something to get to/from work quickly.
I'm not only on "newbie" level for Mustangs, but for all things mechanical as well, so I'll try to draw from the memory of my conversations with the mechanic as best as I can. Last week while driving to work in the morning, my Service Engine light came on. I had just starting noticing a sluggish acceleration, but decelerating was fine. Later in the day, I started to notice that while cruising at 40 mph, the car seemed to be slightly jumpy as if there was water in the fuel line or as though it was going to stall. After coming to a stop, it idled as if nothing was wrong at all. Oh, and my gas mileage is starting to suck.
With just that explanation alone, the local mechanic determined that I had a faulty spark plug or plug wire. He added that there may be a problem with the TFP switch. Plugs and wires were replaced and I've noticed a definite change in how quickly I leave the stop signs. But, the jumpiness is still there. Does this sound like a TFP switch problem to anyone else or is it too difficult to make that call without having it hooked up for a diagnostic? A friend of mine seemed certain that the oxygen sensor may be behind the problem.
Any/all suggestions are welcome. I hate shelling out the cash without a second (or third, fourth) opinion.
Thanx in advance!