I have a 1990 ford bronco w/ a 5.8 and e4od. I have had troubles with performance. When the car starts up in the morning, it feels very powerful, but there is a strong gas odor from the exaust. However, when the car is warmed up, it runs terrible. The engine is louder and it revs higher. I have checked for trouble codes, but there are none. Any suggestions would be appreciated.

 

I'd start with a thorough search of the vaccuum lines and accesories to rule out that possibility.After that ,do a major tune up to include the plug wires,fuel filter & PCV valve.Also scrub the throttle body clean of carbon/sludge around the throttle plates.I have noticed an increase in driveability problems since winter has gotten near,and,those engines need to be tuned up and ready for the cold surge.
Phillip