Engine Performance problem
2002 Nissan Sentra 4 cyl Front Wheel Drive Automatic 139000 miles
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I have a 2002 nissan sentra gxe 1.8litre auto. Idling fluctuates between 1500-2000 rpm. When I put it in gear it will wind up to 5000 rpm before it shifts into 2nd gear if it shifts to 2nd gear. I have changed the tps and the idle air control valve with no luck. Service engine light is on. Codes received are for Tps, wrong AT shift points 1st and 2nd gear. Checked for vacuum leaks, found none. Check for air restrictions, negative on that too. Fuel pressure is not an issue. Any Ideas what the problem could be.