Hey any thoughts on this one, I have a 99 4.3 gm sonoma Just rebuilt the engine, ran great took it out did the break in method. went out this morning about a mile away the engine lost power 2000rpms max 30mph tops, checked out a bunch of things,fuel pressure OK, fuel filter new, even took the spider out a stuck the old known good on back in,no codes showing, checked anyway, clear no codes stored.
Any thoughts on this would help edit:The first cat blew apart and pluged up the second one
Any thoughts on this would help edit:The first cat blew apart and pluged up the second one
Last edited: