sounds to me like you have a vacuum leak. When you lose vacuum the brake booster doesn't operate right. You need to go too a different mechanic. Could be the idle selonoid staying open or even a bad brake booster or vacuum hose came off.
SOURCE: my 2000 GMC/jimmy suv starts up but doesn't respond or rev up whenI push the accelerator pedal
Leland,
Check the Cat Converter --- and the fuel pump pressure. If either or both are faulty the engine will run at idle but stave out when a load (gas pedal) is applied.
I think I answered this once before ---FixYa keeps sending the question.
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