Is it possible to adjust the idle speed on a 70 c10 350 stock without a tachometer? I recently got the project truck 3 weeks ago and since have raised it back to stock height, adjust panels, cleaned up the interior, connected the heater hoses, adjusted a loose lifter. Yesterday I changed the oil and oil filter, also changed out the spark plugs. I found the old spark plugs in bad shape and one fell apart as I took it out. SO since yesterday the truck has been running really smooth, the knock even went away. Except it seems to be idling fast, the oil pressure gauge at idle sits just a bit above 1/2 and the second I release the brake pedal it wants to get up and go.
Any way is there some way I can or should I slow the idle down? Can it be done without a tach?