Hydraulic Power Assist Steering System problems of the 1997 GMC C1500

Power steering assist tends to pull the wheel to the right or left with too much assist after barely turning the wheel one way or the other (has always done this since new). Windshield wipers have recently been acting up when activating the washer mechanism. Sometimes they won't work, sometimes they stop in the middle of the wipe cycle. The date below is a required field, but the incidents have happened numerous times since I purchased the vehicle new.

Variable speed steering is very intermittent.

Engine started misfiring, shaking and burning gas like a gas guzzler, took it to dealer and said that two injectors were damaged, replaced one and repaired the other. At idle (750 rpm)speed engine is intermittent . As for the steering, while driving at cruising 45-65 mph it was impossible to control vehicle, steering felt like a feather in the air, uncontrollable. Unit was taken to dealer in three different ocasions for the same problem, every time was something different, as I was told by the service persons. On July 16/98 drove it to a different GMC dealer with the same problem a week after I pick it up and was informed they had to replace the ps pump. Still, to park the vehicle is a nightmare, you have to struggle with the steering wheel, like the old times when trucks did not have ps. Seems like a have a lemon but since in pr there is no lemon law I have no choice but to continue paying gmac in order to protect my credit.