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Bitching about perhaps having a grimey idle air control (IAC), it's located under the intake manifold. You'll have to take it out and clean it with carb cleaner, the two large hoses that go in and out of the intake manifold lead to the IAC it regulates air and is a little motor that opens and closes a little door, and a little mouse lives in it with a little piece of chee....wait a second.
Yank the IAC out of the car and run carb cleaner through it, fill it, cover the holes with your fingers, shake it and repeat the process until the carb cleaner runs clear. After that and in addition to, clean the throttle body (TB), the TB contains the butterfly that actuates when you hit the gas, that thing is grimey and must be removed from the intake mani., get a new gasket and a small brass brush, spray it with carb cleaner and scrub the crap off the inside of it. This cleaning may also necessitate a real adjustment of the idle.
Also clean the flame trap, it may be housed between the last two fuel injectors and prevents backfires, if it gets clogged you will be adding pressure to your engine seals, it is hidden, so be brave and grab it, it's about an inch in diameter and is inside the larger hose and at a bend pull it out and clean it with carb cleaner, need more info on that, do a search. A small hose runs from the side of the flame trap unit to a small brass fitting on the intake mani. this fitting can get clogged too, stick a paper clip through it to make sure it's clear. Hopefully this will help. And as if I haven't rattled on enough you should also look into replacing your engine wiring harness, if you plan to keep the car. Volvo's wiring harnesses were clad in enviormentally friendly insulation that eventually fell off the wire, resulting sometimes in an erratic running condition. You do have the option of rebuilding the harness but you can buy one at www.ipdusa.com, install it yourself it's not brain surgery. Allright if you do that then you can keep the car and tune it properly and drive it for a long time which precludes buying a new car and paying a car note on something no doubt inferior to what you've got now.
Josh
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