i would appreciate any input

background: i had a bad cylinder on my 5.9 motor...no commpression. since i had a ton of miles i swapped it out for a 5.9 from a later model.

previeous to changeing motors i started to get a terrible shuddering while driving..gas it and it would go away...it got steadily worse and more frequent.

now after getting the new motor in..which sounds great...i have a loud popping sound around the cat..its not a backfire...it sounds like the cat...and the shuddering is still there although not as bad

the popping sound only happens when reving it up

could both issues be the converter due to driving with a bad cylinder

 

Get that converter out of there asap!

 

More likely the bad cylinder is due to the cat being clogged up.

Pull the pre-cat O2 sensor out of the cat, take the truck for a ride, any better?

 

well i was 98% sure the cat was bad by the popping....would a bad cat also make the truck shudder?

 

It will give you all sorts of performance issues.

 

yep, LIKE A CHAMP!

 

thanks for the advice...since i have no welder available i have made a appointment to get the cat out....i would try to take the pre cat senser out as soon as it warms up...20 below last night
just what would i look for after taking the senser out?

 

For it to run better.

 

i guess im not getting why taking out the senser pre cat...would make the cat work...or in effect make the truck run better


maybe im stupid

 

If the cat is clogged, removing the the o2 will give the exhaust some place to release itself.