I have a 1999 chevy tahoe 5.7 with 150,000 miles. sometimes when i start it the check guages light will come on. when this happens there are 0 rpms and the speedometer is not working. Yesterday it happend while i was driving and it felt like the transmission didnt want to shift out of gear it was realy sluggish. If i turn the truck off and start back up its fine. have not checked for codes yet but was wandering what would make it do this.
It sounds like the speed sensor is faulty,but you should have it checked in case it is an output or input sensor too.whats happening is, since the computer has no eyes it totaly depends on sensors to know what is happening,if it sees no speed it won't up shift the transmission because it thinks your sitting still.
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