Two problems related to gas recirculation valve (egr valve) have been reported for the 1996 Plymouth Neon. The most recently reported issues are listed below.
Front windshield and the rear winsdhield freeze overnight in the wintertime. The egr valve busted open, and the car stalled continuously. It was unsafe and unfit to drive. I had a major oil leak and the engine head gasket needed replacement.
Transmission was replaced at about 35,000 miles under warranty, new transmission is beginning to slip. Headgasket has failed twice causing internal damage that the dealership won't admit to. Engine block or other part is cracked, leaking oil into cylinders 1 and 3, problem wasn't corrected last time in shop. Brakes fail regularly, especially under quick stopping attempts, even though the pads/shoes are still good. There is a gas leak that allows fumes to enter the car. Egr valve is broken and won't be fixed under warranty even though it's part of the engine. Paint is chipping on the bottom half of the car and the panels are now rusting. Car stalls in reverse. Car idles roughly even after tune-ups. Heat/ac knobs are cracked due to improper drilling.