Get a scanner that you can monitor live data while you are driving and when the engine first starts up. Usually a vacuum leak is the cause for stumble on acceleration and stumble on deceleration. Monitoring the Long term and short term fuel trim will determine if you have a vacuum leak. A vacuum leak will show a short term fuel trim of + as the computer is trying to compensate for a lean condition.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD