need help setting timing

1998 GMC YUKON
189,000 MILES
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I replaced intake manifold gaskets because it leaked antifreeze. Put it all back together and forgot to plug in to distributor. Started it up, truck ran horrible. Found that I forgot to plug into distributor and plugged it in. Restarted, and still ran bad. I have a car medic diagnostic, plugged it in and got 7 codes. Unplugged it, plugged it in again and I got 10 codes. Is there any way to test the computer to see if there is something wrong with that? Or what should I do?
Thanks
Scott M
Mar 1, 2013 at 1:35 AM
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ASEMASTER6371
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we need the codes to help you

Roy
Mar 1, 2013 at 1:44 AM
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