thanks guys for your replies and patience i really appreciate that,i called the guy that did the swap for me and asked him about the ecu, and he told me that he guarantee it a 100% that it's not the ecu, he said that it could be ignitiion related, so don't even bother try swapping ecu coz it's not necessary that's what he said,
for the main relay like i said i can hear it prime but not that good,it's not loud enough to hear it, it has to be really quiet around and you have to listen very good for the prime, the click is good enough to hear like after the prime,
the problem started around july of this year up to now so it's been 3 months now,first i change the cap,rotor,wires (aftermarket) and spark plugs (oem ngk),but it didn't fix the problem,so went to a shop to check the ignition timing and replace pcv valve,and the mechanic noticed that the vacuum line for the fuel pressure regulator is not hooked up so he fix that also but there's one vacuum line that is not connected to anything and he says that he doesn't know where it goes he just plugged it coz everything is hooked up right even the one for the secondary butterflies are okay,exept for that one,it's located behind and below the intake manifold,but after he change the pcv valve,fpr vacuum hose and ignition timing the car runs perfect for a week, then it went acting up again, and the idle is really low, so took it to few mechanics and none of them knew what's wrong,so i decided to change the fuel filter and do a fuel injection flush and it work for few days idle was fine car didn't sputter and jerk,then it came back again but still idles fine,coz no mechanic can pin point the problem i figured oh shoot this is gonna be a guessing game, so i went to a shop again to test the injectors and results were fine they all have even pressure,so i did another fuel injection flush just for the heck of it maybe the injectors are just gummed up badly,and again it worked for few days then the problem came back,so i change the ignition coil but it's still doing it, then i start thinking that maybe something clogging the fuel system coz everytime i did a fuel injection flush the car runs perfect for at least few days,but can't do that all the time coz it's an expensive maintenance,and i forgot to tell you guys that the problem started when i use the lucas fuel injector cleaner the upper cylinder lubricant or maybe it's just a coincidence,
and the problem starts after 15 minutes of driving.
and when i didn't use my car for 6 days it was stalling and sputtering so bad but after few minutes it idles fine again but like i said after few minutes of driving the problem starts again like it's not getting enough spark or fuel, do you guys think it's ignitor? main relay? or i need to put oem cap rotor and wires, or maybe i have a bad fuel line? i know this is a guessing game but i need to change some parts until i fix it, but which one do you guys think i have to replace first,coz i'm like 90% sure it's ignition or fuel related problem.
it's only happening when decelerating.please reply and thanks for your time.