Rough idle and takeoff 250 inline

[68gmcdude]

[QUOTE=HO455;9346799]One of the best troubleshooting tools for this would be a quality vacuum guage. Old school mechanics used them regularly to direct themselves towards the problem. Every Chilton and Hayes repair manual has a section on how to use one.

After reading your initial post my first thought was that you had a burnt valve. At this point if you don't want to use a vacuum guage and you want to check your compression do a leak down test instead. Properly done a leak down test will tell you if you have a valve sealing problem, a ring sealing problem, a bad head gasket or cracked block.

I just ordered a leak down tester. Thanks for the links. Great info.