Hello i have a 1987 blazer with a 4.3L swap out of an 88. i had to redo the exhaust but i left the cat outside and it rained (not sure if thats bad) anywho i put a new exhaust on front to back no muffler. i just put in a new fpr and fuel pump which solved my other problem. my new provblem is that on hills no power and whenever i step on it on normal roads sometimes it will pick up other times the rpms will get high and have every symptom of going faster but it doesnt? follow? i need help please