What has happened to my truck???
When in idle, I can hear it sputter from time to time...even when driving down the road it seems to be doing this.
Can this be a bad/clogged cat?
It almost sounds like pressure is building up in the exhaust and then releases through the pipes, not very loud, just noticeable.
Idle 'jumps' from 600 to 800, up and down.
Any ideas????
I'm still waiting on a dyno tune to figure out more, but until then i thought one of you guys could help.
Fuel filter? Cat? O2 sensor? injectors?

any advice appreciated.


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