I swapped my 350 in my 92 chevy pickup with a 454. I changed the sensors that needed to be changed and I got a custom chip burnt but it still won't run right. It has really high idle (1700 rpm) and when I put it in gear it just hunts and it has no throttle response. I've tried almost everthing I can think of and I'm pretty well out of ideas. Anybody done this before and can help me. I'd really appreciate any help or ideas.