When it doesn't seem to respond, do you notice if the engine RPM's are going up at all? Is there any change in the engine sound?
Also, is the check engine light staying on when the engine is running? If it is, you should have the computer scanned for diagnostic trouble codes. Here is a quick video showing how it's done:
I realize most people don't own a scan tool. However, most parts stores will do it for free. If the engine light stays on, have that done and let me know what codes are retrieved.
Let me know.
Saturday, June 27th, 2020 AT 7:41 PM