My 96' was throwing the same codes and number 4 kept missing each time the codes were cleared. This occurred around 120,000 miles and running sluggish and rough. Come to find out, the valves needed some major cleaning. I also had all of the hoses replaced. The cleaners you used burn off before they reach the back valves. So, in other words, your valves may be sticking. My Bumble Bee runs like new.
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