Two things I'd first put an in line filter in the gas line to catch those small specks of rust that will pass thru the sediment bowl.2nd check for intake leaks,my 1550 and my 66 were doing similar to your 1550.Apparently the intake will warp on the Olivers, the 1550 was hardly noticeable but the 66 which kept running worse and worse had clearly warped upwards.Good used replacement manifolds fixed both of them they will now idle right down and accelerate smoothly.Also when installing the manifolds tighten the bolts first that apply pressure to the intake ports to make sure they square up to the head.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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