From CHiPs Online:
Jon returns from some time off to learn that Ponch got a record number of 278 citations in one month. Then they respond to a call of an officer down and find he limped off.
After the theme, Ponch and Jon stop a van and find out the driver is one of Ponch's high school buddies. Later, two of Ponch's buddies are out on the highway ram 22 cars and lose control. When Ponch and Jon chase them, they refuse to stop. They manage to lose Ponch and Jon so they park the car, take the plates off, and run.
While Ponch and Jon are at lunch, Jon talks about his previous partner, Gary, who died chasing a speeding car. Gary's brother Pete works at the place where they were eating. Back at Central, Sarge withdraws Ponch's commendable incident report when he finds out that not all of the citations were Ponch's...some were faked.
The next day, one of Ponch's friends (Rudy) decides to try to ram more than 22 cars. He ends up causing an ambulance carrying a girl in an iron lung to overturn. As our heroes arrive, the fake CHP leaves. Ponch pumps the lung in the ambulance while Jon tries to keep pipes from crushing the ambulance. The pipes are finally lifted and the girl is transferred to an upright ambulance.
Later Ponch responds to a stalled vehicle, and Jon watches the fake CHP. Back at Central, Jon figures out that Pete got ahold of one of Ponch's citations to copy and that he has been acting as a CHP. Jon follows him the next day in his truck...speeding past him on the highway and getting pulled over. Pete explains that he thinks its his fault that his 28-year old brother Gary is dead. Jon arrests Pete and tells him to turn himself in the next day.
Later, Ponch and Jon chase after Rudy when he's out playing bumper cars on the freeway. They find him hiding in a junkyard. To keep him from escaping, Jon almost kills him with a forklift. The next day, Ponch and Jon find out that Pete turned himself in and will probably just end up on probation. They also help the girl in the iron lung celebrate her birthday.