I have a 1988 iroc 5.0 tpi and it is idling roughly and doesnt rev properly, strong smell of fuel, i have noticed a vacuum hose has come off at the front left side of the plenum near the coolant hose, for the life of me i cant find where it goes, i hope this is the problem...
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Did you change the fuel filter after changing the pump ? And if so it Sounds like you have a vacuum hose off or crossed some where . Is the R.P.M going up and down. And if so it is a vacuum LEAK Check your rubber in take boot, being lose or a crack in it and change your gas cap be leave it or not you have a closed fuel system And if It's defective It can contribute to this
Do you know what fuel pressure regulator is ? These like to leak when they get older !
The cartridge type fuel pressure regulator (1) is a diaphragm-operated relief valve (6) with fuel pump pressure on one side, and regulator spring (2) pressure, and intake manifold vacuum on the other side. The regulators function is to maintain a constant fuel pressure across the injectors at all times. The pressure regulator compensates for engine load by increasing fuel pressure as engine vacuum drops.
The cartridge regulator is serviced as a separate component. When servicing the fuel pressure regulator, insure that the O-ring backup, (3) large O-ring, (4) filter screen, (5) and small O-ring (7) are properly placed on the pressure regulator.
It's located on the fuel injector fuel rail !
If you have a strong gasoline smell, get that car into a mechanic ASAP. Forget fooling around trying to discover the problem yourself. Gas explodes, right? You already have a strong smell. That means that somewhere down the fuel system line there is an active leak and that is dangerous. The fact you have to post here means you don't know anything about a car, so stop messing around with a potential lethal problem. I am an old alley mechanic from wayyyyy back and am speaking from experience.
Sounds like your car is over fueling. My first quick look is to make sure your throttle return spring is intact and still connected. Next remove the air ducting between air cleaner box and throttle body so that you can see that the throttle plate is fully closed at start up. If OK then reinstate the temporarily removed ducting. Next I would check your fuel pressure relief (FPR) valve on the fuel line. When the engine is running remove the vacuum line attached to it and check for fuel dribbling from it or a strong smell of fuel. If the FPR is normal and healthy the engine would normally increase in revs for few seconds and then begin to idle roughly. Put your finger over the end of the disconnected vacuum line (if healthy the engine would resume normal idle after aout 5 seconds) and watch the side arm of the FPR for about two minutes. If fuel eventually spits out then change the FPR. Sometimes the diaphragm within the FPR which is acted on by engine inlet vacuum can split and the fuel behind it is sucked into the inlet plenum making the engine rev and idle roughly.
SOUNDS LIKE A VACUM LEAK,POSSIBLY INTAKE GASKET OR VACUM HOSES,GET SOME BERKIBLE 2+2 SPRAY DOWN INTAKES WHERE MEET HEAD AROND THROTTLE BODY AND ALSO EGR VALVE TO MAKE SURE IT ISN'T PARTAILY STUCK OPEN, VACUM LINES AIR INTAKE HOSE BETWEEN THROTTLE BODY AND AIR FLOW METER,ALSO MAKE SURE ITS NOT DRY ROTTED AND SUCKING AIR,THE ENGINE IDLE SHOULD GO UP OR DOWN DEPENDING HOW BIG THE LEAK