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1977 C10 350CI - TH400, Last week I drove it to the store, I took off normal from the stop sign & the engine rev. & barely more. Did the same 2nd & 3rd, If I shift it 1st, 2nd, then 3rd manually it slips but not as bad. The truck has 29000 miles on it now, but it sat for a long time. I've had the truck about a year & put about 1500 miles on it. Would a clogged filter do this or do you think it's something else?
Yes there is, those valve guide seals?