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Hello all. I’m working on a 91 Mitsubishi 3000GT with under 115k on the clock. At intown speeds and highway speed the car stutters. It would also idle at 300rpm. From a dead stop it would accurate okay but wouldn’t drop down to a low gear for good passing power (automatic), stutters at 3000-4000 rpm and then run strong to 6000 rpm. I cleaned the ISC (idle speed control) which was packed with carbon. I also “seafoamed” the car. It now idles at 900 and drops down to a passing gear but still feels low and power and still hesitates and stutters at highway speeds / 1400-1800 rpm.
Please advise
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