93 town and country

There is a hesitation when you start out until you hit 3000 rpm's then it
will take off. you can also hear some pinging. Is it the timing belt or what
else could it be!!! I've replace the ignition coil box, plugs and wires, erg
valve, fuel filter the O2 sensor. I am now out of Ideas except for the
timing. Is there other sensors that it could be?????????

 

Dont see anywhere on here what engine it is?? Have you checked fuel
Pressure

 

Are there any codes? If not try the crankshaft sensor. These will cause some
strange behavior. YOur tach will jump alot too when the motor misbehaves.
Larry