1999 Chevy Blazer Idles really bad and kills Please help

I recently posted about this and had a reply about the P1351 code. I was given a diagram that is hard for me to understand. So please dont send it again. But here is an update.

I replaced the crankshaft sensor. I used an ohmmeter and checked all the wiring and nothing is wrong that I can find and I am stumped. I dont know what the problem is.

It starts. But it idles really bad and then it kills. If I press the gas pedal too hard it will kill. If I press the gas pedal lightly, the engine slowly catches up with me and revs up. Sometimes at idle, it will act like its going to die, but then revs up by itself. If I put it into drive or reverse it kills.

The RPMs do not work.

I replaced the starter, plugs, plug wires, distributor cap, rotor, ignition module, camshaft sensor, crankshaft sensor, MAP sensor, fuel filter. Checked and cleaned the air idle control valve and sensor, checked the throttle control sensor, cleaned the egr valve and pcv, patched up all the vacuum leaks I can find, oil change, radiator flush, checked and cleaned the MAF sensor. Checked the fuel pump and fuel pressure and it is good. I also checked and double checked to see if the timing was correct and it is correct by the book.

I scanned it with a scanner too.

Here are the codes:

P1351 Ignition Coil Control Circuit High Voltage
P0140 Downstream heated o2 sensor circuit high voltage(bank1, sensor2)
P0108 Manifold Absolute Pressure sensor circuit high input. (I keep getting the code, but I already put 2 new MAP sensors in it with in the last week, and I still get the code)

I know that the O2 sensors are bad, but I should still be able to drive it. Some mechanic told me the other day that my catalytic converter could be the problem. He told me to take out the O2 sensor after the engine before the cat, and if it was the problem I would be able to drive it. But still I have a problem. I did tap on the converter with a rubber hammer and I heard rattling.

Please Help. I hope this is enough info. I have a 1999 Chevy Blazer 4.3l 4wd V6 Enhanced Distributor Ignition.