Have your shop check to make sure the correct, updated air pump was installed and the new hose and tube assembly are properly routed. Also, check the pins and terminals on the solenoid connection -- corrosion could cause an intermittent connection triggering the light.
Q I am the first and only owner of a 1986 six-cylinder Pontiac Fiero with 100,000 miles on the odometer. I keep the car in my heated garage, but it has not moved in the past three years. I pulled it out last month and went for a short drive. The "brake" warning light comes on, and I have no brakes. The pedal goes all the way down to the floor. The brake light stays on for about 15 seconds, then goes off, and I have normal functioning brakes. This happens every time I apply the brakes, but the light comes on only when the vehicle is moving. I am 74 years old and I want to be able to enjoy the car during the summer months.
A I suspect a faulty brake master cylinder. Worn or stiff cup seals in the master cylinder may be allowing a bypass leak when you first apply the brakes. Instead of hydraulic pressure expanding the cups and sealing against the cylinder wall, fluid may be bypassing the seals, allowing the pedal to travel to the floor.
Here's a quick test. With the engine running and the vehicle stationary in Park, gently, slowly and smoothly push the brake pedal down. Does it travel to the floor without engaging the brakes? Now, release the pedal, wait 15 seconds, then quickly stab the pedal firmly as if panic-braking. Does the pedal hold firm with the brakes engaged? If so, you've identified the problem with the master cylinder. A new, or rebuilt master cylinder and a complete flush and bleed of the brake system will hopefully get you safely back on the road this summer with your Fiero.
Q My 2004 Buick LeSabre has 116,000 miles on it. The last three times I have been in rush hour, after 10 minutes of stop-and-go congestion when I accelerate back to normal freeway speed the transmission bucks as it goes into first and then second gear. This problem disappears completely after I turn off the car. Unless I am in this situation, the transmission operates perfectly. I am assuming it might be a sensor.
A The "check engine" light would be on if there were a sensor problem. However, the transmission fluid temperature sensor may be commanding "limp mode" operation because of high transmission fluid temperatures. A scan tool can identify any fault codes and can read the transmission fluid operating temperature to determine if there's a problem.