misfire on#2 wen going 55 or od on on 1997 Ford F-150

have changd egr valv and relay

Asked by for the 1997 Ford F-150
3 answers
should have wires. probably water in #2 plug hole. did one last night same plug. blew out water, pulled plug and cleaned it. run ok.
Last GOOD tune up?? And the engine is? Different ignition systems!!
scan codes and post so we can adv