It did have a linkage attached that stumped me as well. The shaft that the linkage is rivited to pulls out of the TPS unit without any means of retaining it in place. once you pull the the shaft then you can very carefully split the plastic housing and expose the electrical contacts. Be careful not the bend the tiny metal fingers that make up the potentiometer - they are very delicate. I broke one but mine still worked after reassembly. I cleaned it with some contact cleaner and then applied vaseline (clear) grease to the contact surface. worked for the remainder of the summer - fingers crossed. If you post a picture of your assembly I can tell you if it is the same as mine. Judging by your symptoms, it sounds like the same problem.