The Mechanic is wrong, the light must be cleared with a scanner then the car driven for a few days, if the light comes bgack on the EGR Valve likely was not the problem.
It would help if I knew the fault code you read.
SOURCE: 02 monte carlo, radom misfires, EGR circuit failure
Does it misfire under load like when you press on the gas peddle after slowing down then accelerate or at idle. When you say spark plug did you mean all the spark plugs?
SOURCE: loss of power...2003 chevy monte carlo
catalitic converter if car is under 80,000 miles or 8 yrs dealer must replace free i had same problem
SOURCE: 1998 monte carlo brake light problems
Turn signal switch. With you foot on the brake have someone stand behind the car. Wiggle the turn signal lever and see if the the brake lights flicker.
SOURCE: 1998 Chevrolet Monte Carlo brake lights do not
I had to replace the turn signal switch in my 1998 z34.Now everything works fine.
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