Bob O'Neill has been plagued with this problem on his 1986 base Daytona for several years on and off. He cleaned all the connectors, tapped out continuity and resistance readings. The root of his problem came down to fractured or relaxed contacts at the ECM, where the TPS signal feeds in from the harness.
Unfortunately, Chrysler used a horrible contact design at the computer connection:
http://www.molex.com/molex/products/datasheet.jsp?part=active/0008500030_CRIMP_TERMINALS.xml
These terminals will embrittle and crack with the slightest exposure to any caustic compound such as ammonia fumes (read - windshield washer fluid).
I think you will find that these terminals are either broken off, or have lost their springiness, at least for the TPS signal.
Unfortunately, Chrysler used a horrible contact design at the computer connection:
http://www.molex.com/molex/products/datasheet.jsp?part=active/0008500030_CRIMP_TERMINALS.xml
These terminals will embrittle and crack with the slightest exposure to any caustic compound such as ammonia fumes (read - windshield washer fluid).
I think you will find that these terminals are either broken off, or have lost their springiness, at least for the TPS signal.