Engine stumbled in drive way....why?

1999 SATURN SL2
175 MILES
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RAY59
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Car was running great my wife pulled into drive way the engine stumbled my that's what I was told,I went out started sure enough it did the same thing went into engine bay initially the same situation suddenly the problem corrected itself.What are some possibilities don't want to be stranded.The report was as she pulled up it ran fine when the brake was applied it stumbled.
Sep 19, 2011 at 10:47 AM
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MERLIN2021
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check for vacuum leaks especially booster and hose. I use spray of either water or tbi cleaner when idle changes you found s leak. also pull the hose off the booster and pull the plastic check valve out
see if it allows air to pass only one way by blowing and sucking on it. air should pass only one direction replace it if not this way
Sep 19, 2011 at 2:58 PM
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RAY59
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Please explain the following "pull the hose off the booster and pull the plastic check valve out
see if it allows air to pass only one way by blowing and sucking on it." I understant I may be looking for a possible vacuum leak what is Booster? what check valve PCV? thanks.
Sep 19, 2011 at 3:45 PM
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MERLIN2021
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the piece the hose attaches to is the check valve and can be pulled out to test it.
Sep 21, 2011 at 8:40 AM
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RAY59
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Hey Guys here an update SL2 hesitation,the mechanic didnt find a vacuum leak but they cleaned the throttle body tech also said he could not clean iac,or map sensor.Here is my question the fuel filter is not scheduled to be changed for 25K will just change it now is there a way to test fuel pump without pulling the tank down?
Sep 24, 2011 at 12:53 AM
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MERLIN2021
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Use a fuel system pressure tester to check pump operation.
Sep 24, 2011 at 6:50 PM