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There are codes for both the IAC and the throttle position sensor, but I don't think they would necessarily be tripped if it's an intermittent problem that goes away once the engine is warm. It's interesting that the IAC in my '97 850 looks not much different from the one that was in my '81 245, so I don't know that there was much new in the way of sensor circuitry. In fact, when I did the PCV system, the IAC was pretty well stuck closed, but didn't throw any codes. The TPS may be a different story, as there are three codes for it. Nevertheless, just because you don't get a code doesn't mean it's working entirely well. Keep us posted on your progress, I'm sure others will want to know!
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'96 850 and '83 244 DL both at about 200K; gone but not forgotten '81 245 and '64 Amazon
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