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according to my factory manual published 3/93, 221 is a code for lean conditions at partial loads. before looking for anything real, make sure the hose from the mass meter is intact. then just pull the fuse by the battery and wait a bit. this will reset the adaptation in the ecu. if you get 221 again, then there is a problem. i will tell you, i have repalced a coupla ecus that threw codes for no apparent reason. that's why i always reset first and wait. if another code comes back, then reset again. if 221 comes back, then let's chase it. good luck, chuck.
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