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Message: <blockquote data-quote="PapaSmorzy" data-source="post: 1504179" data-attributes="member: 29412">I recently came into possession of of a 2004 Base Model 3.8 V6 Mustang. During my test drive I experienced no problems and of course the guy I got it from said it had no problems but, here I am so apparently not. My current most concerning problems are:1. At some point in every drive, I have a problem where the car won't pass over 2000rpms and it pops and rattles but no power. If I leave a red light and this problem is happening, I can't go over 25 miles an hour until it "fixes" and I regain power. It doesn't happen all the time but probably about 75 percent of the time it's having this issue.2. It's misfiring on cylinder 4, I'm not sure if this is part of the previous problem, but when I pulled the spark plug for cylinder 4 it was wet, and all of the contacts were gone, so I swapped a new one into it but I believe it is still misfiring. The other codes it throws has to do with oxygen sensors I think, I'll get a printout later today.3. When I let off the gas pedal while driving the car slightly decelerates like it's rolling backwards or something.Some evidence I've found of potentially concerning things:The plastic antifreeze reservoir is cracked at the top.The exhaust manifold is broken right before the donut gasket, I ordered and have received a new exhaust manifold, I just need to find a plug for it because it has an extra fitting on it.A guy at oreillys said that these cars rely heavily on the o2 sensors to control the timing? Is this true?</blockquote>