ok i grabbed some wd40 hopefully that will work... were do the ecu grounds run too?? firewall?

WD-40?! WTF? WTF do you need WD-40 For?!?!?!

clean the grounds, is that bad

it's not they are dirty, they are just old. the ground are hooked up by gauge wire, gauge wire eventually stops carrying current. there are many grounds throughout the entire car.

well i use the wd-40, specifically on one ground on the firewall, took off the connector spraied it all up and i started the car and it revs up to 6k then at idle with the oil pressure back to 30 psi... ill take it out for a spin later and see

and then your 4krpm hesitation will come back later on if the wd-40 temporarily fixed the problem.

if thats the case ill rewire

if thats the case ill rewire