89 mustang

ok i have a 347 stroker efi with heads cam intake, 30lb injetors 75mm TB 76 mass air for the 30lb,up grated fuel pump. my car has been sitting for almost 2 years and ones i got my 347 back togeather and put in like 2 mounths ago i have replaced the TPSsensor, MAF sensor the water coolent senser and one o2 senser one by one cuz the ecu would pull up the codes that they were bad..

ok my car dont show any more codes and my problem is that it runs verry good and strong for a wile then it seems to crap out and it will do this all day every day and i cant figure it out so i hope some one here could help me out!!

what i meen by craping out i mean like it just loses power and trottle response
it dose not sputter or anything like that.

do u guys think my ecu is bad?

stanks347

At what rpm is it crappin out?

Tony71502

Restab the dizzy?

AdderMk2

i love how everyone automatically assumes that their ECM has gone bad... lol

mjr46

does the car stall out at all and have to be restarted??.....also check all your ground and battery connections

89 mustang

no it dosent stall out. when its runing good it idels right at 900rpms and when its runs like crap it idels right around 650-700rpms.

what do u mean Restab the dizzy?

mjr46

define more of the "runs like crap"??? that description is to vague

Tony71502

Restab the dizzy = remove and reinstall the distributor, making sure it is properly oriented and timed.

It sounds to me like your timing is off enough that advancing or retarding will not help.

stangman5.01988

Do you mean when you first start driving it drives good and crap do mean after you drove it for a while?

89 mustang

ok u guys i no its been a wile but i fixed the problem! all i did was get anothere ecu harness and motor harness and now it runs good all the time no more craping out any more..