Surging and Unsettled Idel after MPS Rebuild, '74 2.0L D-Jet Options

[914four]

Running down a bucking issue and found my MPS to be leaking. After rebuilding the MPS and verifying a good seal, everything went back together okay. When I started the car, the engine surged up and down and would not idle.

The electrical connector socket on the MPS does not appear to be keyed and using the diagram below from Clay's D-Jet troubleshooting guide it seems I may have plugged in the MPS wire incorrectly. I ohmed the wires from the ECU connector to the MPS socket and made sure the wires are in the order shown in the diagram.

The wires look to be looping back from terminal 7 to 15 and 8 to 10 so that the socket could be plugged in either way and work correctly. Could plugging in the MPS wires incorrectly have damaged the ECU? If not, what should I be looking for that would cause the surging and lack of idle?

[914four]

Thank you all for the responses. I was able to check my hoses to make sure they are all connected properly but still have the same surging issue. I would rather not spray all the hose connections with a flammable spray to check for leaks. The hoses are only a couple of years old and in very good condition. I'll look for another way to check for air leaks.

I replaced the copper diaphragm as well as the O-rings during the MPS rebuild. The Diaphragm did not seem to have any breaches but it came with the rebuild kit so I replaced it. My MPS had two large thin O-rings for the case halves on top each other and the kit came with one large thick O-ring as a replacement. I replaced the two large O-rings with the thicker replacement O-ring. I also replaced the small O-ring. I used the method in Chris' instructions for installing the diaphragm which had me measure the depth of the diaphragm nut setting and using that on the new diaphragm.

It looks like my next steps are to verify no air leaks then send my MPS to someone who has the equipment to setup the MPS with a bench circuit for proper calibration. Jeff has been very busy lately and has a back log of wiring harnesses to build. He may not have time for MPS calibrations but I'll check.

Thank you again for the help.

Kelvin