Question about 1991 Chevrolet K1500
Unfortunately you are going to need fairly major work. From the sound of it - the head gasket has gone - allowing the combustion gasses from one cylinder to get dumped into the oilways - pressurising your sump and probably spraying your engine bay with oil.
Being sluggish is lack of compression - because it is leaking internally - into the oilway.
It's quite a regular shop job, so get a few quotes before booking it in.
Posted on Sep 30, 2009
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Posted on Jan 02, 2017
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