420A 95 Eagle Talon ESi (at my wits end)

[jesse12345]

I have a 95 Eagle Talon ESi with the 420a with an automatic, bone stock. This is not my car I've been working on it for my buddy all summer. It has 150k miles and has been sitting for 10 years.

Here's what I've done so far, it has a rebuilt head I put on with new head gasket and head studs. I've done a coolant temp sensor, MAP sensor, cam and crank sensors, coil pack, spark plugs, fuel filter, 3 different fuel pumps, timing belt, water pump, tensioner, thermostat, throttle body, PCV valve, 3 different sets of injectors, 2 different fuel pressure regulators, front O2 sensor, and last but not least both sets of intake gaskets.

My problem is it either has a hard start or it rev hangs and smells like straight gas. It used to die after 10 minutes of driving and that's when I tried the fuel filter so now it doesn't die and drives great down the road. Sometimes when coming to a stop the RPMs would dip so low it'd die, and it sounds like it's got a small misfire.

I'm at my wits end with this thing I've swapped literally every sensor in this car 3 times from all my spare parts or I've bought new if some tested bad. I have not a single clue what to look for next. It's throwing me no codes and even when I hook multiple different scan tools up I get nothing.

 

[CKOPOCT]

Have you checked for a vacuum leak?

 

[chrisman287]

Fuel pressure regulator?

 

[jesse12345]

Yes I sprayed everything in carb cleaner absolutely no change. I've checked all vacuum lines along with that vacuum box on the back of the engine. They all checked out and on the 95s they have the fuel pressure regulator on the fuel rail, which I've swapped with multiple different ones. Still no change and I'm at a dead end.

 

[jesse12345]

Okay so I swapped throttle bodies and it no longer revs high. It drives perfect but it smells like it's running rich and it will rev hang pretty bad. I start it every morning and it fires right up and has zero idle issues it's only when I tap the gas does it hang. I'm about to swap the brake booster because that's the last thing I can think of in the vacuum department.