I wasn't aware of this
I have a 96 with a consistent miss at speeds I changed plugs wires cap rotor fuel filter new tps egr valve blah blah . I think the original injectors or dizzy it's self are bad .. what do you guys think this is or am I way off track . $300 for injectors and 260k miles .. let me know much appreciated
lower intake gaskets might need to be changed. if they are still stock at that mileage then i about bet you thats where your problem is. my stock intake gaskets were toast when i took everything apart to fix a bent valve, and i had a consistent skip and the engine would completely bog under hard acceleration or hauling a trailer.
you could also have a cracked head or blown head gasket. you can check for cracked heads or blown head gaskets by opening the radiator and seeing if you notice any bubbling back (compression escaping the cylinder), or check for water in yoru oil. if you have soem carbon in your coolant system that can also be a clue that exhaust gases are making their way into the cooling system through a crack in the combustion chamber. if your truck has ever ran hot, go ahead and expect atleast one of those vortec heads to be cracked, because the way they cast them was kind of stupid, there is no meat, so to speak, behind the combustion chamber. its hollow and is apart of the cooling system. you can repair a cracked head like this by a technique called pinning, and then put new valve seats in them. but you will spend approx the same fixing those as if you would buying a nice new set.
but tearing off the intake really isnt that hard. take it off, clean everything down and get yoruself a nice set of those felpro metal core/silicone lined intake gaskets.
i would also suggest that, atleast to me, its easier to remove the whole intake (
upper and lower) in one go than to try and remove the upper intake by itself. then once its out you can take it and have it cleaned by a machine shop, and then put new gaskets and swap the fuel injection assembly.
edit: also, do not ignore the skip, you will regret it. i did and ended up getting pissed because of how ****** it was running and just held it to the floor, which bent a valve. luckly it did not knock a whole in a piston or bent a wrist pin, or damage the connecting rod or bearings on the crank. luckly a valve job did it for me.
so if i were you, i would suggest with your milage to remove intake and heads and have a valve job down on the heads because carbon build up keeps exhaust valves from closing, which will cause a miss... and replace head gaskets and intake gaskets. there is a felpro set that is heavy duty for these motors which works quite well. just installed them on mine. but like i said, do not ignore the miss. it will get worse and worse. and then youll be crying. you will be better off having a valve job done because if you just do the gaskets on the intake and have the same problem, then you have to take the intake BACK off AGAIN which is a pita. so i suggest to just do it all in one go... oh and put a new timing gears and chain and timing cover. also, watch out for the pesky oil sending unit when you are reassembling lol
