I have a problem with a 1990 245 5 speed stick, when its cold, the car bogs a-tad like its getting too much air vs. fuel mixture. It performs better when warmed up.

The car has 208k, These are parts that were replaced Remanufactured air mass meter from "Fuel injection corp." , new plugs from Volvo, flame trap cleaned,25 amp. fuse holder replaced, cleaned all grounds for f.i. ,large plastic bellows from air mass to throttle body, cleaned out vacuun hose, cleaned black breather box, cleaned idle speed stabilizer. What next?

Seems no one has your answer for your problem, thought there was somebody who could diagnose this simple problem. Good luck!

Thought you would have hads an answer to your f.i. problem by now, I believe try your f.i. seals at the intake manifold.