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the flat spot is a missing instruction in the CPU program in the ECM. Run the fault codes to check for faulty sensors or have the CPU program reset using the scanner. Loose wires would give a problem all over and not just at particular rpms
94 chevy 3500 dually 6.5L turbo diesel - starts fine- then sometimes when hot, turns over but hard to restart, sometimes when driving and I accelerate it hesitates or misses as if not getting fuel I let off of pedal then re-accelerate and smooths out - any idea ?
Actually there are two kinds of engine hesitation.One is from fuel then two is the air .The mechanic should check on the fuel filter .look if the fuel that is going to the fuel pump is dirty or worn out . check the fuel filter then look if it is dirty and needed to be replace or change.Then the second is that the air filter it should also be check if dirty then replace it so that no dirt will go to the engine . if these problems are not solved then the cylinder will be having a problem that will cause the engine to hesitate.And always check the fuel you use to place to the fuel thank if dirty or diluted just to be sure.
first how many miles are on this blazer and have you checked all the vacuum lines on the engine ? also has it been tuned recently like plugs wires etc? It might just be time .. Also change that fuel filter it might be getting dirty also.. just a few ideas holler if you need more Jerry