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Message: <blockquote data-quote="ORVietVet" data-source="post: 21896" data-attributes="member: 9438">Welcome to the forum from Oregon. You are gonna want to go to the #1 post and at top right there are 3 dots and click on that and edit your post title to read 4.8 instead of 3.8.Sounds like you have the start of catalytic converter(s) clogging up creating to much back pressure against exhaust flow. OR, you could have a problem with fuel pressure. To check the fuel pressure attach a fuel pressure gauge at the fuel rail on top of engine. Gas engine fuel pressure should be 55 to 62 psi and flex fuel should be 48 to 54 psi. Also, you could have a clogged fuel filter. Not enough to shut off the full flow but enough to restrict the flow and cause power problems. If you have no idea of the age of the fuel filter, change it and see what happens but still do the fuel pressure test, especially before the filter change and then after. To check for back pressure problems, you need to run a back pressure test on the exhaust system. Sometimes you can have a CEL with back pressure problems and sometimes not.Also recommend doing what [USER=6175]@stutaeng[/USER] recommended. Live data scanners are not that expensive.</blockquote>