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Message: <blockquote data-quote="hottwheels04" data-source="post: 1436857" data-attributes="member: 8550">Ended up not looking like either coil or distributor voltage came back good drive starts fine./ but now sitting all winter. I finally was able to  drive it today first nice day for spring,  So  I replaced the black coil for iginition to distributor that is on the passenger side firewall under the intake.  because coil next to  and distributor looked fine. I was thinking maybe fuel pump. well today I drove it check engine light came on and then went off.I made another new thread heres what I posted new codes came up the old ones are cleared. so I think i fixed the other problem  I had in this thread. now looks like its fuel pump and 02 sensor voltage issue related. ike title states check engine light came on stayed on for a little then randomly went off on its own and did not come back on. I scanned it with the obd1 scanned I get 6 codes. 10,121,176,511,542,543.1995 for mustang gt 5.0I'm thinking fuel pump is going bad? 2 codes 542and 543 are to do with fuel pump. 1 code is rom failure. one code is to do with voltage to high, 1 is to do with 02 sensor.Codes definition are as follows:10= n0 defition for it? 121= closed throttle voltage higher or lower then expected176= hego)ho2s) sensor fault/always lean511=read only memory (rom test failure)542= fuel pump secondary circuit fault543= fuel pump secondary circuit faultWhat do you guys think ? where to go from here</blockquote>