This forum ROCKS! 2002 S10 Blazer broke down on my 17 year old son on the way to his prom last week. I had it towed home and then began diagnostics. I found this forum and searched the DTC's. The P0300, p0155, p0135, p0102 and P0101 were solved after reading several threads and following CAPT HOOK and others insight. The P0300 was the rotor screws broken in the distributor cap causing the random misfires. Replaced with AC Delco cap and rotor and it fired up. I test drove it and it would lose power around 2200 rpm. So started the diag on P0101 which proved to be more difficult. After searching the posts and following the forum and Capt Hook's advice I did several tests including MAF and ALL fuel tests. The fuel leakdown test for Pressure regulator and injectors were at the low end of the threshold but passed. I then removed 1 o2 sensor upstream of Cat converter and test drove with no problems(except for loud exhaust). Went to local tire and muffler shop and had cat replaced. That solved the problem. My son has been driving to school and said it hasn't run that well since we bought it in 2014! THANKS TO ALL WHO CONTRIBUTE!!:

 

Nice work!

 

Thanks for the excellent feed back and details. That's what is critical for the success of these posts. A clear statement of the problems and then the solution of the problems.