i have a 92 f150 nite package 302 and e40d originally had a 351w but that hydro locked and blew i swapped the motors and now has a 92 5.0l ho with a cam duration of 256/258 lift of 477/484 also ported and polished heads (edelbrock performer) intake and shorty headers all ported to match. now that being said i have a severe high idle prob it idles at about 2200 in park and 1100 hundred in drive not sure what could be the prob ive tried to look for a vacuum leak and it is timed correctly any advice would help btw its multi-port injection not sure if its sequential or bank blast

 

IAC stuck open?

 

No its brand new and clean

 

Could it be from the ecu beacues a 302 finiring order than a 351

 

*is different