try checking your throttle position sensor. Disconnect the three wire conn. to the sensor [ blue,black and orange wiring harness] Check the resistance across the sensor side of the connector. A good sensor will check out as follows> blue to black>5000 ohms pedal in any position.
orange to black> best to use an analog meter> The readingshould vary from 0 to 150 ohms with accelerator @ rest. up to 5000 ohms with accelerator fully depressed. Hope this helps.