I have a horrible vibration and I am wondering if parts store sold me a 3800 series1 flywheel or I have a series1 engine with series2 intake in my 96 firebird.

Something made this automatic 3.8 engine vibrate tremendously after new flywheel and 5 speed was bolted to is.

Can a series2 intake be bolted to a series1?

I have heard the series1 fly wheel on a series2 will do this so probably vice versa.

I see on the grenaded 3.8 that came from this firebird it has 3800 series2 stamped on the side of the block so guess I have to find out what this replacement 3800 is first.

and help appreciated!