hi all. hope someone can help. ive just changed the throttle position sensor due to it playin up. now the check engine light stays on even tho i have fitted the other one. what could this be caused by. also now it runs really spluttery and doesnt feel like its fuelling properly at low revs in low gears altho when i open it up in third and fourth it seems faster. does it need a rolling road setup or ?? any advice welcome. thanks in advance. paul-s.

 

just like to add its a 98 UK car with a full HKS de-cat and k&n filter.