About 1 month ago I had a liitle push as I was slowing down. With the manual trani it's easy to feel.
Just before I would come to a complete stop, I 'd get this slight jump like someone bumped me from behind.

In neutral, I can rev the engine a bit and let off the gas, Just before it reaches Idle speed the engine would rev a slight bit.
I replaced the Fuel Pressure Regulator figuring it had 90K miles on it anyway and the 1 code (221) told me I had a Lean/rich mixture.
That solved it until last night.

A few traffic lights I felt the same little 'buck' as I slowed down. Just as I was thinking " damn, it's back again, the engine light came on.

CODES 221,223,231.
The one that is probably the cause of the other two is this 223 (fault in Signal to/from air control valve). what, where is the air control valve? That's not the Idle Control Valve, is it? geeze, 18 years with tis car and I don't know where this is. sad on my part.
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'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm