My father recently bought an 87GT 5spd but we have been having an intermittant problem with it stalling in 1st gear when u go to pull out. Occasionally the idle will dip down to like 400 and wanna stall and will unless u really gas the **** out of it. Any ideas as to what is causing this. Im thinking a sensor but have no clue which one to try first. It kicks out no codes. thx for any help..jay