Suburban start up with no problems.... after running for a 1/2 hour it's losing all power... dosn't matter if im driving ( if it shut down while driving, I can let it sit for a 1/2 hr and it will start back up with no problems)or just parked and running... where can I start with troubleshooting????
Do a back pressure check on the cat converter if gas powered. Diesel doesn't have one. If you get 1lb or more psi of back pressure the cat is bad. Also check the fuel pressure with a gauge when this happens.
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