my power steering becomes heavy after about 5 mins of driving, and im getting the rev drop when i stop, ive cleaned and resoldered afm, and changed the o2 sensor, ive also cleaned the aac valve which was black as the ace of spades! now im getting it but not as bad, ie its not stalling anymore! i think it could be a fuel pump earth issue, or the tps is not set correctly. ill be investigating this weekend.