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Check engine light, very rich or very lean 200 91

I have just bought a 240, 1991 volvo and am just trying to get the bugs out of it. We have had it for 4 months and it has always been hard to start. It will often require two cranks and they are long 4 to 5 seconds. Yesterday the Check engine light came on and the codes were

231, 232, and 221 meaning engine is compensating for very lean or very rich condition. Any ideas were I should start in diagnosing this problem?







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