Q: Im not getting any preasure from front right cylinder could this be a blown head gasket 1994 gmc Jimmy

你好呀：

It’s very possible that reduced pressure from a cylinder is an indication of a blown head gasket. In most cases, this problem is caused by damaged piston rings or a hole in the piston, but a blown head gasket could also be the cause of this problem. If you’ve recently had an overheating problem, then I’d lean toward the gasket.