A couple of months ago the blazer quit. I had it towed and they told me that the crankshaft sensor was bad. They also changed the plug wires and the cap and rotor because they said there were sparks flying everywhere. When I picked it up I had a heck of a time starting the engine. Almost like it was flooded. I start getting random misfire codes as well as evap codes. It also smelled like gas. They changed the roll over valve and that fixed that issue but I was still getting random misfire codes. I changed Fuel Pump due to loss of pressure right after turning off the engine. I changed the fuel regulator and now I get 55 to 60 psi on the fuel pressure. I changed the spark plugs. I changed the MAF sensor. I changed the fuel filter and changed the air filter. It seems to run OK but lacks a little power. It recently started throwing crankshaft sensor intermittent failure errors along with the random misfire codes. I had the shop change the sensor 2 more times under warranty and I am still getting that error.
All this points to something wrong with the crankshaft sensor circuit. I was thinking of running new wires from the sensor to whatever the sensor plugs into. I am assuming the sensor plugs into the computer someplace. I am receiving misfire counts on most of the cylinders not just one.
What do you guys think might be the problem? I have read about the ignition switch but I really don't want to throw money at more parts without some testing first. Maybe I could bypass whatever the circuit the ignition switch makes.
I can connect my computer to the blazer and monitor all of the diagnostic data and so far nothing has jumped out.
Anyways, any ideas would be great.