While compression test is something that I might do, It would be much easier to simply hook up a vacuum guage. I usually go for the easier things first.
see...
How to Use and Interpret a Vacuum Gauge
and look at scenarios 5 and 8.
I'm thinking that if you have a bad valve you may have a miss, and maybe some blowback to fowl that one plug.
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
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