Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is ***** ***** I can help.
What have you done so far?
Do you have a scan tool that shows live data?
Does the RPM jump up or down when this happens?
Can you post your VIN# ***** I can see which engine and trans you have.
This was doing it before you replaced the plugs?
Does it feel like going over speed bumps/ strips?
Can you keep it running bad long enough to see if the engine light flashes?
Have you ever had it scan for codes.
Most auto part store will scan it for free.
When you give me your VIN#
I can check for Special Coverage Adjustment - Throttle Position Sensor Replacement
the throttle position sensor may cause the engine to run rough and cause the malfunction indicator lamp and/or an Engine Reduced Power message to illuminate. If this occurs, it could result in reduced engine power.
If you are getting Engine Reduced Power message? I would verify that DTC P2135 is set as Current or in History.
If so have the dealer perform #11273B — Special Coverage Throttle Position Sensor Replacement.
This special coverage is good up to 10 years and 120,000 miles
When they check for codes have tell if any other codes are set.
This may not fix the shudder but will fix the Engine Reduced Power message.
Just checking see if you still need help.