96 S-Blazer SES MAF/CPS codes

I have 96 s-blazer,90K, 4.3 vortec,4x4. symptoms are slightly harder cold start, hesitation from stop, bucks one time after warm after leveling off throttle, SES light on with codes set for mass air flow and cam position sensor faults. Both have been replaced as well as O2,MAP,TPS, and full tune up. Unit had been driven several months at lower than normal operating temp as the thermostat was found to be opening early.Any one have similar troubles or ideas?