1996 Chevy Truck Continues problems, No power, Hard starts

Ok well its a 96 chevy 1500 v6 4.3 with a rebuilt trans about 10k old. I have had several fuel pump problems replaced it abour 4 times, luckly autozone warrentee cover replacement, the last time I notice a slightly frayed wire in the fuel pump assembly, fixed it no problems for about a month, then it died again wasnt able to start at all, just try and turn over. On the side of road dropped tank again, installed new pump. Started right up. But only had about 75% power, cant go over 3000 rpms just act sluggish. Been getting worse only way its been working is b/c ive been babying it. Starting my truck has been getting worse over last couple of weeks. Yesterday it wouldn't crank at all. With key in ON pos, fuel pressure is 60 but wasnt holding more than few seconds, figured fuel pressure regulator was at fault replace it, same problem, finally started went to drive and same as before. Tomorrow gonna double check Crankshaft sensor. No check engine light, No power and hards starts have to (I think) relate to each other. BTW about six months ago I was having two codes cant remember them but they were both cat releated, I (being stupid) figured it was gonna have to be replace at some point and clogged cat could cause loss of power. Anyway I cut out the cat about a month ago after I notice loss of power thinking it was the culprit, straight piped it and all O2 sensors are plugged in. Sorry post so long, thanks for your time