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hard cold start, miss at idle 200 1992

I am having trouble with cold weather starting on our '92 240. When the temp drops below 30 it is hard if not impossible to start. Turns over fine. I check the FI and engine sensors via the diagnostic port and get no trouble codes. Thought it might be the ECT. Could the ECT be bad without showing a code? the car otherwise runs fine when it starts. Lately I have a bad intermittent miss at idle also. This does not seem to be the slight ignition miss but a more severe sudden cut out and recover. Recent major tune up. Engine runs fine at all speeds otherwise. No apparent vacuum leaks. I did notice yesterday that the TPS is missing a screw and is loose could this be it? I am currently looking for something that fits it is a small screw!






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