Getting high idle when stopped and transmission taking long to shift on 1999 Ford Expedition

All this happened just after a rain storm
Getting No Codes
Hesitating when taking off
New IAC installed

Asked by for the 1999 Ford Expedition
Most likely a throttle position sensor/circuit problem. Scanner can check this rather quickly!!
Thanks for reply .... will be checking that
You bet! Also, this problem may NOT set a code but a scanner can read the TPS to see what it is doing. Trans. shift and idle are VERY dependant on the TPS signal!!!
Thanks for the HELP, it was the TPS
You guys are GREAT!!!!
Glad to help!
Thanks for the reply.