hi, i just bought a 91 xr2 with a blown turbo. i got another out of a junk yard, known good. put it in. now the car is idling at 4,000 rpm. it appears that the throttle is advanced, like someone has their foot on the pedal. these cars are new to me. i must have something unhooked, but all the hoses are on the right place i think. any suggestions please? could i have missed the ground wire to something? thanks, larry