Hi guys the past months I've noticed my car is sometimes hesitate especially when it's cold it will bog down then back fire then take off it's worse when Its worse when cold I have no clue what it could be the fuel filter is fairly new less than a year and I was running a open element air filter and I thought maybe switching to the original would fix it but anything changed anyway help would be great

 

You need to check the fuel pressure, what year, motor, port or tbi injection?

 

91 305 tbi

 

The spec is 9-13 psi, autozone has a tbi fuel pressure tester that you can rent or buy. It'll have a fuel line adaptor that goes between the feed line & the throttle body.