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TFI - Little greyish plastic thing mounted to your distributor. Cheap and go bad often. Buy 2 and Always carry a spare just in case. It has the obvious plug and a couple screws holding it on.
Of course you can always dump the codes since that is always what you want to do first for any problem. Code checkers are about $30 and are at all parts stores and at Wal-Mart.
My Wal-Mart also carries the TFI and is cheaper than parts store.