I just got a 90 240 sedan and after an initial tune up of dist cap and rotor and the correct spark plugs, it still seems to start rough, but run fine. I put another spedometer unit in it, (the old one was non functional) and the check engine light fleckers at idle, but comes on brightly at higher revs! No codes are set in the computer. This car looks like it had a rough past life, and I suspect that the reason I got it so cheap is becaus it won't pass emissions up-state. (My county doesn't have emissions inspections)
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