ok here is the deal I have the L36. I have replaced the lim gasket and uim with the reduced stovepipe and the metal sleeve. secondly I am seeing the oil pressure guage dip three tick marks below 40 when the engine is heat soaked and up to temp at idle and it feels like the car is going to stumble and dye. secondly the coolant is getting drank and I am not sure where it is going. third I have a new fuel filter and new plugs but the wires are old. I will be putting a new o2 in tonight other then that the only other thing I could think of is a dying fuel pump. and lastly my mileage has gone to hell. I have changed the oil and it is still done the oil pressure thing. any Ideas?

To add to the above question, what is the lowest the oil pressure should read? When my car is hot, sitting still in gear, mine reads at 40 or on the first line below 40.

not sure but in my 02 at temp and at idle it read a little under the 40 also (just a tad) my 95 reads right at 40.

I think something didn't go right in the LIM/UIM deal. If it'* drinking coolant and not leaking it, that'll explain the rough running, as it'* going into the cylinders. Is there coolant in the oil? That'll explain the oil pressure issues. You gotta find out where the coolant is going. Fast.

list all parts numbers and what gaskets you used