1987 TBI 305 problems. HELP!

[badbowtie89]

I bought a 1987 Chevy v10 with a throttle body 305 from the car dealership I work at. Within a week I already had to replace the clutch. I pulled the engine out to do this (I know it was harder this way)
When I put the engine back in, I ran it and it Service engine soon light came on. I read the codes and it came back with code 22 "low voltage at throttle position sensor" I replaced the TPS and it ran fine. The next morning I go to start it and it idles high then drops down to about 500 rpm and the SES light comes on. I decided to drive it and it would randomly cut out while driving at low rpm. Once it got warm the SES shut off and it ran fine. Once I stopped I read the codes and it comes up with code 21 "High voltage at throttle position sensor".
I'm confused on what this means? The sensor is new and everything. It just runs like **** until it gets warm.
Any help or advice is appreciated!
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