First stop would be the TPS(throttle position sensor)
Get a volt meter and a sewing pin, straight pin.
Set volt meter to DC volts, like 20vDC setting
Remove throttle linkage cover, plastic piece covering linkage
Turn on the key, leave engine off.
There are 3 wires on the TPS sensor
Pierce the top wire with sewing pin
On the volt meter put the Black probe on a ground, battery is fine or clean engine metal part.
Put Red probe on the Pin
Should red 5.0 volts, 4.8-5.0 is fine, this is voltage From the computer
remove pin and pierce middle wire
Touch red probe to it, should read, .70-.99 volts, under 1volt
Slowing open throttle and watch voltage, it should increase slowly, no jumping around, nice and steady.
When throttle is open all the way it should be above 4.6volts
Then close, and watch voltage again.
ANY jumping around of voltage means replace TPS