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ok i just finished installing my upper and lower intake for a 3800 series grand prix non super charged. i started it up and it muffuled like it was gon shut off wat would cause this do i just need to let it run for awhile and it will it go away maybe air got in the hose lines...i dident take out the spark plugs i was thinking that mite also bee it too i seriously dont know????

Do you follow are proper torquing procedures?

Did you disconnect the battery?

You may have to let it run for awhile. Take it for a drive around the block. Any codes?

yeah i followed evrything ima take out the spark plugs n crank it over and see if that helps

would u happen to know that lil plastic tube inside the upper intake does it matter how you put it bk in does the bend part go on the left up are down facing the map sensor

Read this first:

viewtopic.php?f=2&t=14

It will help us better help you.

Did you read this before you replaced the UIM and LIM gaskets?

ok i just took out the spark plugs and put them bk in and they all looked alright started it up and my car still putters like it wants to die and now my check engine light is flashing before it would stay on and go away now it flashes i dont get what would be causing this??

It would have been nice to know that the check engine light had been on, I did forget to ask that. Do not run it with the cel flashing! Get the car scanned and tell us what code you have.

ok found out the code it say p0306 cylinder 6 miss fire... would that cause it too pudder like its gone die??

ok i also for got to say that on one of the fuel injectors the plastic tip is gone that wouldent cause it to pudder thou rite

Is it cylinder 6 that is missing part of the injector?

yes i believe so but that shouldent causs the car to act like it wanna die should it....aww and do you know what that code means?

Yes, the codes mean there is a misfire on cylinder #6. Exactly what you stated earlier.

Now you have to figure out what is wrong:
Bad plug wire?
Bad coil?
Malfunction/broken injector?

.....a piece missing on the injector is a great place to start, IMO.....

Depends on which piece is missing. If it's just the piece that holds the o-ring in it should be OK, but what happened the first time Andrew and I did my LIM gaskets is that one of the o-rings got caught and torn when we put the injectors in, because it was missing that plastic piece. Easy way to check is spray some carb cleaner or something similar on that injector while it's running, if it smooths out for a second, that's the culprit.

ok it turned out just too bee the injector like i thought but thanks for all the advise