There are, I believe, three 8-pin connectors in the engine compartment, all on or near the suspension towers. But this TSB suggests something: one cure for driveability issues, all due to electrical malfunctions, is to disconnect every electrical connector under the hood with the sole exception of the oxygen sensor connector, spray it with Caig Labs "DeOxIt", and reconnect using silicone dielectric grease. Volvo began using this at the factory sometime in late 1991, so your car may suffer from corrosion. Get the DeOxIt at a quality electronics supply store catering to computer geeks. Radio Shack does not have it. Or order directly from Caig Labs in California. This is a miracle substance useful for many electrical maladies.