98 Buick leSabre exhaust leaking water/antifreeze after upper intake replacement

[bmob222]

Car: 98 Buick leSabre
problem: exhaust leaking water/antifreeze | gas on spark plugs causing misfire
What have I tired: I replaced the upper intake manifold and gasket| cleaned off and replaced sparked plugs and cleaned plug wells| changed coolant sensor(broken)| thermostat

The Buick is still running supper ruff and the misfiring, also when I get it to start i have to hit the gas or it would stall out, the exhaust has a dark water coming out of the exhaust. I really love this car so any help would be much appreciated.

 

[NFortin198]

I would have to say that either the new gaskets shifted during installation, the intake was improperly torqued down or you have a leaking or blown head gasket.

 

[HotZ28]

Have you checked the fuel pressure regulator vacuum line for the presents raw fuel? There was a recall on this particular model FPR. What does a fuel pressure drop test look like?