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2001 Blazer, Weird Surging under a load? Ideas?
Im having a very weird surging issue when i drive the truck which is so bad its really undrivable right now. Ive checked the fuel pressure while im driving and its reading accuratly, right around 60 under a load with no adjustments in pressure while the surging is going on. Just think of being in the truck and you would floor it then let off floor it and let off, thats what it feels like. Ive takin to a couple places and noone can figure it out.
At idle truck sounds normal. It begins after about 5 min or so of driving and doesnt stop, and vehicle very slowly excelerates.
For awhile it was throwing PO128- Coolant Temp Sensor. I replaced this part and it still does has the problem.
So now, same prob, but no service engine light after i reset it with the obd 2 reader. I was told there that it could be a bad Fuel Injector Module, but i dont even think that the vehicle has one.
Any ideas what to check would be greatly appreciated.