The lack
of response to the accelerator pedal has quite a few potential causes that would have to be
sorted out in a diagnostic including, just as a few examples, plugged fuel injectors, faulty oxygen sensors, fuel pump and / or filter, vacuum leaks including that caused by a faulty EGR system, ignition system malfunctions, bad valve timing if the timing belt or chain is worn or skipped, blocked exhaust (e.g., catalytic converter fails or becomes clogged), a faulty
airflow sensor or throttle position sensor, and so forth.