Mazda Repair Questions? Ask Mechanics for Answers ASAP
Hello and thank you for your question,The TP voltage and percentage should start to move the minute you start to open the throttle. If its not then it may be bad but as you suspect, in most cases if there is a problem with the TP the computer will usually set and store a fault code and you will usually feel a hesitation. If you looking at this signal on your scanner then its likely a normal reading because on most scanners there is usually a few second delay streaming the data. If you are not having any symptoms then you likely do not have a problem.
What your seeing is very likely the normal reading because most scan tools have a sight delay in the streaming data on the scanner. If you not feeling any hesitations and or setting any fault codes then you do not have a bad sensor.
Have you made sure the throttle body is clean and that there is no sludge build up?
Its normal for it to go rich with the MAF disconnected, are you sure your not dealing with an engine vacuum leak?
Have you tried carefully spraying some short sputs of car cleaner in around the intake and TB area? Sure sounds like a leak to me if it will not idle.
Your very welcome , just be sure to do it carefully staying away from any ignition source to avoid a fire.