Okay, sounds a little a fuel delivery issue.... computer can see things that aren't there and some things it misses because it can't see....

So, it will crank and no fire, and sometimes crank, sputter and then die?

This is getting somewhere..... explain the circumstances again, and type slowly, I'm having trouble keeping up.... I think....

91 Jeep Wrangler YJ, carpet, tires, trailer hitch. yea....