Hard start running rich under 4000 rpms

[614talon90]

Ok so recently I purchased a 1990 talon awd. This is not my first dsm it's my fifth but I've never owned one modified this much. I bought the car with a very rough speed density tune on it. I managed to get it worked out and running and idling very well, until yesterday. The car had been fine and then all of a sudden yesterday it started acting up. While cruising the AFRs were reading between 11.5 and 12.5. Then at idle it was around 12.5 to 13.0. Although it was running and not misfiring it was very rich. So I parked it then today came back out to start it. It gave me an awful time starting it. I had to crank and crank and crank it before finally it would try to start and it just kept dieing before even going over 1,000 rpms. When it did finally start it shot the rpms up idling around 2,500 rpms and running very rich. I've check the fuel pressure, replaced the coil(I had a new one laying around) and I cannot find any boost leaks or vaccume leaks. I also checked the coolant temp sensor and it seems to be working properly. I'm kinda stumped on what to check next. And guidance would be helpful. Thanks

 

[nasty_4g63]

Do you have a CEL?

 

[614talon90]

No although when I drove it the cel kept turning on and off. But that was probably because of spark knock.