this is what I found out. fuses are fine, intake has no leaks.
still need voltmeter probably get one tonight.
I sat through erratic idle for longer than usual and exhaust pipes under car started smoking. I first noticed burning smell and then smoke from back of engine compartment. i looked under car and it was exhaust pipes. But temperature gauge does not read well. car should have been at operating temp. and gauge reads a whole 1/4 off. it is just above the blue. when usually (when operating correctly) it sits right above 1/4 line<and when shut off gauge will go right below middle mark. so temperature gauge still not reading right.
and I disconnected brown sensor it actually made the idle rise (probably 300 more RPM) and still rev up and then go down and continue doing so.
Throttle switch disconnected makes idle sit high up at 3000 RPMs.
No hum from ICV still need to check wires that lead to it see if there is voltage like u said. and check ICV terminals for ohm resistance.<<<is this with car on or off???
thanks for the help!!! after this ICV and icv line test I should have better understanding of it being the actual ICV or the electrical lines<<<possibly idle control unit.
found a good thread on IDLE PROBLEMS and diagnostics.
check it out Idle FAQ