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If it has to run a bit, i would suspect weak fuel pump
If its random, i would clean mass air, and see if it helps, then spray engine with starting fluid to check for vacuum leaks
My experience is trash goes to the end of the fuel rail and dumps in the last injectors. Remove the fuel rail with injectors attached and pull #1 and gently tap it upside down on a block of wood with a sheet of white paper on top. Use grease on the injector orings when reinstalling.
originally posted by: tinner07
a reply to: mtnshredder
It's a real good possibility that you have a intake manifold leak
Ok if that is the issue, would a rainy day let it draw in moisture and run worse? That kinda makes sense to me