Have a 87 iroc 350 bored 40 over,2032 cam,dart aluminum heads.Now I bump the fuel pressure up to 37psi running at idle with hose attac.unplugged it's 45.now I have the timing at 8degrees I'm probably will bump it to 10 and see what happens.But the car is hard to start,like ever time I spin the engine over it will hit and run maybe for a sec.then after a few trys it will start and run.Now it also has sucky throttle response I've set the tps to 54v still sucky.Now I think someone before me mess with the idle screw would messing with that cause a fault in the tps?

 

I'd look for vacuum leaks and test those injectors just to start to rule things out. Is it running rich or lean is the next question...pull a few plugs and see what they look like.