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I do need a vin # ***** the vehicle to assist.
ok i do need you to double check the vin # ***** (pic would be awesome to verify)
what I want you to do is at the battery area is the ecu for the engine and there should be a vacuum hose . replace that vacuum hose and the recheck the running of the vehicle
please let me know
where are you located . i need to know elevation level.
was the surge evident before the timing belt was replaced?
was a compression test performed and a leak down test . this is an interference motor and if off by several teeth you may have a slight bent valve causing this issue!!
please let me know
what is the fuel pressure when off idle and cruise when the surge occurs?
what is the fuel pressure when the vacuum is removed from the regulator?
if at 44 psi then i would recommend to remove the grounds and clean and then retorque . most of the grounds are arounf the battery area and chassis frame in that same area. there are some on the block that needs to be checked also.
the ecu ground is under the hood and need to make sure on that
SOMETIMES . WHEN THE SURGE OCCURS SPRAY SOME FUEL IN THE THROTTLE BODY TO SEE IF THE IDLE CHANGES
LET ME KNOW
pic of sensor area and sensor please