Will not accelerate fast without popping and sputtering, but will accelerated slow just fine

Fuel injector nozzles can become clogged over time, which can lead to a sputtering engine, slow acceleration and the car not having enough power. ... Bad or Dirty Spark Plugs: Spark plugs are responsible for igniting the fuel in the combustion chamber.

fuel filter needs replaced or fuel pump

Scan for codes stored ion the OBD computer. Many auto parts stores can do this for you at no charge. Based on the results - a complete tune up may be in order.

Good luck!

Does it use spark plug wires or individual ignition coils for the each plug?. My 98 intrepid uses coils and occasionally I have to change them out cause it would start to miss when normal temperature was achieved. If it uses wires, try replacing them, along with the spark plugs.

dirty throttle body, check air filter.

fuel injector will throw a code but plugs and wires dont. you might have a vacuum leak also. check brake booster and vac lines on brake system and intake mannifold.

lot of grand ams had catlytic convertor would clog up

something electrical, ignition control module, coil, or ecu check the ICM and coil first, as they are the least expensive, and the most likely culprits. auto zone checks them as long as they are removed first.

This sounds like a problem with the throttle position sensor. Take the car to an autoparts store and have them scan the computer for fault codes stored. Most parts stores will do the scan for free. Getting the codes will narrow down the cause of the problem and should eliminate the need for speculation. Sorry for your trouble and I hope this helped. Best wishes.

my pal jojo had this problem just 3weeks ago and his fix was plugs and wires.hope this helps.