If car is fuel injected check the injectors could be clogged. If car has carborator check to see if the butterfly is opening properly. Check all the wiring for battery and electrical system, too.
If the 1500 Surburban hesitates on acceleration, there could be a few things going on. There could be a problem with the fuel sending unit or the fuel pump. It's also possible that the fuel injectors need to be cleaned or one or more of them may need to be replaced.
fuel pump or the ignition module needs to be replaced
You need to get the temperature sensor repaired or, more likely, replaced.
Check to see if your vehicle jumped timing.
you might want to check for a blown head gasket or a cracked head or block. espically if it loosing water out of the radiator with out leaking on the ground.
It could be defective...hope you got a warranty
it sound like you have A BAD MAP SENCER
It needs the attention of a gunsmith.
bleed the brakes. check fluid level
a lot of 3.1 engines do this, if it is not severe then it should be ok...
Check condition of ignition coil. Replace if bad.
have you checked you fuel filter lately?