1995 Monte Carlo running rough

I can check the fuel pressure when I get home today. What is the fuel pressure supposed to be? I've had simaliar symptoms (loose of power, popping, missing)with other vehicles, when a bad cap or rotor were involved, but this car has coil packs.I do not know how to check if they are functioning properly. Thanks.

I have not been able to check fuel pressure or coil yet, but the coil pack is loose at the mounting point. The bolts that are holding it down are bottoming out and tight. They just seem as though they are too long, leaving aprox 3/8" gap. I know that the previous owner was a younger kid and I have found several things, with the wiring, that have not been correct. The car previously had an alarm system installed, but it is no longer functional. I have found several "rats nest" with the wiring. I don't know if the coil pack being loose will cause a miss or not, but I plan to change bolts, if necessary and tighten while checking to see if the coil & ignition module are functional.

I called and none of the local auto stores test coils and I still don't have a way to check for flash codes, since the only wires in the ALDL are A & M. Since I need to check this myself, what is the acceptable voltage for the coil, using a voltmeter? And what is acceptable fuel pressure? Again this is a GM 3100 V6. Thanks.

I own a Z34 monte carlo 3.1 Litre The 3.1/3.4 coil packs must maintain GROUND so clean, sandpaper base of coil that mounts to engine block and tighten in place using correct bolt length. All GM early prior to 1996 coil / magneto had ground contamination issues caused by Galvanic corrosion [ metal base against Aluminum Block or opposing types of materials in contact], vaseline or anti-seize product eleminates this, plus oil/grease is factor. If still running rough Be sure wires R plugged into coil pack in proper Firing order #1 is closest to curb on coil pack [located above starter below front exhaust header] when U R standing in front of car looking at Motor. GM order is Left To Right-Clockwise same as in Old Dist. Days GM fires clockwise 146325 is 3.1/3.4 coil order. THIS info is important since previous owner replaced all cooling/overheating parts meaning incorrect firing order motor will run hot/rough N in cold surge between 2000 rpm back to 500 then erratically jump 500,1200, to 2000 at idle IT WILL cause U to spend needlessly On mass airflow, Idle air control solenoid etc. Books Do not allows say we define wiring order by sitting behind steering wheel OR standing in front of car.U May Have Leftover problem of Temp Guage to High this will Trigger Check Engine Light. Replace Engine Coolant Temp Sensor near Thermostat Housing Then when Key is turned ON disconnect negative leave 24 hours this reset is too clear codes N reset ECM main engine computer to restart motor must turn key to ON--20 seconds OFF 20 seconds Do this 2 cycles THIS Programs ECM Then U can Start/Test drive. Good Luck.