[67malibu]

I answered most of the questions in the original post. I measured CTS voltage and got values within 10% of specs (the one I replaced last year gave resistance reading way out of spec - yes I test parts when possible before replacing.) The TBI is not stock, it is the 670cfm Holley aftermarket. I put that one on about 10 years ago due to the stock one being worn out (220K miles.) The new TBI had operated flawlessly for a good 8 years before this issue began. There computer communicates fine and is clear of codes. This is an '88, no air temperature sensor. When I get time I will do what I was going to and run some new wires around.