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My recently purchased 1991 C900 is having trouble starting when cold. It takes several attempts to get just started to a very low idle, which cuts out if I try to increase the revs. If I leave it "chugging" for 5 mins I can the slowly increase the revs and it is ok.

Research indicates the throttle body and associated sensors and pipes can cause this type of issue. The last work done to the car before I purchased it, coincidentally, was a throttle body clean but pipes leading to it are filthy. I am yet to pull it all apart to check it along with all hoses etc. With regards to cleaning the throttle body can I use brake cleaner or is that too harsh. They smell and feel (to touch) quite similar in solvent make up.

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