1995 Chev Suburban will not start either

:x 1995 Chev Suburban 2500 2WD/ 280000 km, 5.7L, Pulled unit into driveway. Was running fine. Did not notice if the CEL was on or not. Would not start the next day. Had 2 codes: 22 TPS Low and 35 IAC Error. Don't think either of thse codes could cause the problem and were probably created months ago when I had the throttle body off and the ignition on. Cleared both codes. Have spark, at least 50 psi fuel pressure to the injectors while cranking, fuel filter was recently replaced, timing is within range as far as I can tell since i'm testing while cranking. Replaced the module on the distributor, no change. Ecm must be getting power as I can plug into it with the reader. Air filter is not plugged. Have not been able to borrow a noid light yet to see if the injectors are actually firing ( converted to edelbrock multi-port system. Not sequential, injector harness plugs directly into TBI injector harness). Suspect a crank or cam reference sensor, but all the information I have so far says the distributor module takes care of this( What is this module called anyway? ). Does this unit have seperate sensors or not? If so where are they located and where can I find a schematic? Any information you can give me would be helpful