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cold start problem

Engine

Vehicle Information: Year: 1987; Engine (Size, Modifications): 3.3 turbo european model; Total Mileage: 60,000;

My car went from starting with a turn of the key, to having to pump the accel. with poping and what sounds like backfire in the intake. It runs great warm. Also at what temp should the oil cooler thermo. open. The lines NEVER get hot going to the cooler. I checked the fan and it is fine. I could not get the slotted screw head out of the thermo even though I heated it with a torch. Thanks for your time. Also I had a bad fuel problem a month ago and the fuel system was cleaned, plugs replaced and a new filter put in. Could this be part of that problem?

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