My 2000 Pontiac Grand Am has been sputtering for a while, it has trouble gaining speed and will miss several times while driving. Once the RPMs catch it will gain speed, but it still misses. My ABS light and "trac off" light will come on but will go off. I've replaced the coil packs, spark plugs & wires, as well as the fuel filter.

Your car does not have an inline fuel filter. Do you have a check engine warning light on.

What are the trouble codes stored in the engine computer ?

When you say "sputters at 2000 rpm" , are you referring to ANY time the engine is at 2000 rpm - meaning in Park, when you are just goosing the throttle, or in gear when you are accelerating, or at highway speed in high gear? If you are experiencing a "shuddering" in the engine at certain speeds/rpms - especially if these are speeds you regularly cruise at (long commutes at steady speeds), the problem could be in the Throttle Position Sensor (TPS). They have a tendency to wear unevenly if you drive a certain steady speeds. Eventually, the problem would progress to an engine code, but it may occur without setting the check engine light.

the very first thing you should do is have your fuel pressure checked. sounds like fuel filter or fuel pump.

mass air flow sensor its in the air intake pipe

you have an engine miss, any time the check engine light starts flashing the engine is missing, should be an easy fix sounds like either a bad spark plug or a bad plug wire if you have the codes checked there should be a code telling you what cylinder is missing, but if i were you i would tune up the engine all new plugs and wires and filters......GOOD LUCK

First I need to ask is it a 4 speed or a 3 speed transmission. If it's a 4 speed when driving down the road pull it from drive to third gear. You shpuld hear the engine speed up if it does not then that means you have on 4th gear and you will have to take it to a transmission shop. If it's a 3 speed then just count the shift points if all 3 gears are present then drive down the road and see if the van goes into tcc. When you mean the rpms are high how high are they.

get the codes on trany OBD2. what does the over drive button is saying on the dash Vitally

it would not be an O2 sensor, period, they would never cause a high idle, have u had this checked for trouble codes? A sticking idle speed control air bypass can cause this problem as well as a throttle position sensor, but run the codes, Kragen does it for free was well as other parts stores.

try changing your fuel filter