Hi Everyone,

I have been working on rough idle and high idle issues for quite a while on my 1991 420SEL with 560SEL motor. I have recently swapped out the fuel injectors with another used set, and I was forced to swap my EHA when I damaged the one that was in the car. Today I replaced idle control valve and it solved both issues almost immediately. I also replaced leaking valve cover gaskets and when I went to test drive the car to check all of the work, I noticed that when I accelerated at wide open throttle, the car seemed as though it was starving for gas. The tachometer crawled to the redline and it felt as though the car was bucking. I have never had that issue before though I have not tested it at Wide Open throttle in some time. I went home and adjusted the EHA to slightly richer. The idle then became perfectly smooth. smoother than it has ever been. I took the car back on the highway and it still was not running well at wide open throttle. It is running great at part throttle. Any ideas as to where I should look?

Thanks as always for your input.

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1988 420 SEL
1991 420 SEL with 560 motor
1993 Miata