There was a recall to replace the vacuum hose for the brake booster. In the presence of oil, the original hose could swell and become disconnected. The brakes would function but power assist would be lost and the pedal would feel very hard.
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Most reported Dodge Neon problems
If the screws holding the case of the powertrain control module (PCM) are not tight, the tachometer may fluctuate or bounce from 300 to 1000 RPM while driving at a steady speed.
purchase new in 1997 was back to dealer more times then I can count. They never could pin point a cause; but they tried many things.I worked on aircraft engs. with carbon problems . The answer for my 2.0L IS AC SPARKS PLUGS. 4OZ OF MARVEL MESTERY OIL in gas tank on fill up no problems since. I use this oil in aircraft also