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There are many things that could cause hesitation on acceleration in a vehicle. It could be the fuel pump, the gas pump, fuel pump relay, or an electrical problem.
Could be timing belt/chain is worn
My 89 B2200 does this. Its like there is a dead spot in the acceleration. It is because the accelerator pump is leaking.
A couple of different things could cause hesitation in a 1999 Plymouth Breeze including bad spark plugs. There could also be an issue with the fuel filter.
Turbo lagging. Remove Inlet tube and check that it spins exceptionally freely,and also check that the wastegate and linkage moves freely.
Intermittent hesitation in a car could be caused by many things. The fuel filter, the EFI, and spark plugs might be the cause. A loose wire can also cause this. Newer cars have many plugs and connectors that could have come loose.
Start by checking the EGR system.
Possibly, yes. If the injection system is not providing a steady and regular supply of fuel to the engine, shuddering and hesitation could result. Note that the fuel pump is part of the fuel system, and can cause similar symptoms if it's failing.
There are many things that can cause a 2000 Blazer to have hesitation problems. Some causes could be bad plugs and wires, fuel filter, or the EGR valve.
Could be, time for a tune up.
Could be a slight adjustment of the ( TPS ) throttle position sensor , or it may need to be replaced if it's causing a large hesitation during acceleration.
It could be your MAF sensor. Mass air flow sensor that measures the air going into the intake. This could likely cause sluggish acceleration.