Bought the car new. It has been running perfect since but recently it doesn't run and no one around here has any answers.
When the car starts it acts normally. The temperature gauge rises normally. After about 50 miles, the car begins to stutter or miss fire (it feels like) (quite a definite physical jerking) at high RPMs (4000 +) and the condition continues to worsen down to very low RPMs (2000) until the car does not have enough power to pull its own weight. As I slow down to 2 MPH, and pull over to the side of the road, the car idles at 750 dropping occasionally to nearly zero but not completely shutting off. I can rev the engine to 3500 RPM (weakly, it feels) but when I put it in gear, it has absolutely no power. I wait, go about a fifty yards and have to pull over again. Slipping the clutch, etc, I finally give up and walk home.
I wait about an hour+, return to the car, and it starts up normally. If I drive less than thirty miles the car gets me around and seems to behave normally.
I noticed a faint repetitive chirping sound the last time it stalled out.
The local dealership has (expensively) replaced the oxygen sensor and the catalytic converter in an attempt to fix the problem, to no avail.Their repairs affect the problem not at all.
As you can see, I am not a car expert. I do not trust the dealership to know much either. I have a mechanic who is quite good (but who was stumped by the car's behavior) and I can relay any technical information to him.
I would deeply appreciate any light anyone out there may shine on this catastrophic problem.