Hello, I have a 1986 Oldmobile Delta 88, 3.8L fuel injected V6. It has been very reliable. But my fuel economy has become noticeably worse. When i start the car the idle is really high, even when the engine is not cold. It lowers after a few minutes of driving. The car shakes a bit and it goes away while accelarating, and comes back when i let off the gas. I replaced the O2 sensor three years ago, and did a tune up back then. I have had the check engine light come on a couple of times but the light has not come back on in a few months.
What could be causing my worsening fuel economy?
Again, i have:
High idle speed shaking at idle bad fuel economy
Thanks, hope you can help me out. I care about this car alot.
myc1972