New LIM Gaskets, Now P0300.

[transam24]

Just put on fresh LIM gaskets on my 97 GTP and now I got it all back together and it has a rough idle and stalls. When I first start it up it will stall unless I give it some throttle and slowly let off and it settles down to a rough idle. I suspected a vacuum leak and smoked the vacuum lines and around the blower and manifold with no change in rpm. Once in a while the idle will go up to about 2 or 3k and settle back down. Unplugging the MAF did not help and the idle stays consistent at 2-3k rpm with the MAF disconnected. The only CEL I am getting is a P0300. Where should I go from here?

 

[Timing]

Check your firing order and make sure all your vac lines are in the correct location.

 

[dsmuts]

Also check the egr tube for cracks

 

[primem]

make sure the injector lower o-rings are seated properly. spray some brake cleaner over the injectors where they seat in the manifold. You will hear an idle change and maybe even hear a sucking sound if they are leaking. Air leaks past the injectors at the manifold will cause lean misfires.

 

[bennyboy131]

if you did the job yourself check under the supercharger and make sure its spotless. just did this and I had the same problem. turns out I didnt clean the up side of the lim good enough

 

[transam24]

It ended up being a vacuum leak. I overlooked that I used an l32 supercharger gasket on my L67. Pulled the blower back off and replaced it and all is well