97SilveradoHD
I'm Awesome
i have a 97 with the 7.4 and was wondering what the normal idle speed for this motor is. right now when the truck is at normal operating temp, in gear idle is around 700-750. also everytime i start the truck (hot or cold) the thing revs up to 1600-1700 rpm and then slowly settles back down. i expect this when the truck's cold, but i don't understand why it would do it when hot...? btw, i've already replaced: TPS, coolant temp sensor, IAC, cleaned MAF & TB