First Post here, but been lurking. 2002 Blazer w/225k. I'm writing for my mechanic, I know almost nothing about this. He just did the top end, changed the timing chain and gears, (both necessary) Ran fine for several days, low miles, then tach started to go crazy, with a loss of power and major hesitation. He replaced distributer cap and rotor, crankshaft sensor, (had code P0035 come up). New fuel injection spider installed,also necessary We also cleaned out the MAF with CRC MAF cleaner. After all that still having codes P0101 and P0335 show up. Unable to check voltage today, he thinks it might be an electrical problem, but I don't know where to look for a schematic and voltage requirement for the MAF, MAP and crankshaft sensor. Any help would be appreciated, Thank you