Stuck valve?--340 V8---Compression check RESULTS

You jumped into a rebuild pretty fast.

it would have been worth it to check into a few things first liek had been mentioned.

such as a wet test (you already had a compression gauge....just needed to put a little fluid in the cylinders) and a leak down test.

to me it sounds like either an ignition problem or gummed up valve or bad rings but not a jumped tooth.

I actually just had a 98 jeep cherokee with a 4.0 l that had 200,000 miles on it and it felt like it had a lumpy cam in it because it had a miss to it and when you punched the gas from a stop it would pop and back fire and was very sluggish off the go.

I ran a compression check and a wet test and so on and on all the cylinders it was around 120psi - 135psi give or take and then I found one cylinder that was only reading 30 psi and didnt get any better when I sprayed oil in the cylinder.

anyhow, long story short, I pulled the head and lapped all the valves,put new gaskets on,valve guide seals ,bolted it back together,put fresh fluids in it and it ran like brand new again.

it just had nasty carbon build up on the valves and wasnt allowing the valves to fully seat.

it pays to investigate a bit, you could save yourself alot of cash.

unless of course you have the money to have your engine rebuilt how you want and this is just the excuse to have it done LOL