Did you check around for vacuum leaks? When I installed my intake manifold, it didnt torque down corrrectly and I had a leak on the intake manifold seal so I had to readjust it. I dunno if you took off the intake manifold to do the plugs or not but if you didn't use a new seal, thats one spot to check.
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R.I.P. 8/01/13 1SlowZ
One day I'll have another....
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