I am assuming this is a non supercharged car. I have had this problem before be sure to check every vacume line there is a plug at the left end the plentum its a plug for the boost valve (ie. supercharged motor) this has a rubber o ring its orange, you have to twist plug to get it out. Make sure its seated properly adding a small amount of oil to seal to help it seat also pull a vacume on it a see if it holds a vac these motors are twitchy when it comes to vac leaks hope this is of some help. If you had plentom gasket changed check to make sure every thing was tighted down properly take care to look at both ends of plentom one question was the intake gasket replaced also if so permatex is used on the ends so check there also this sounds like a vac leak very small one but one none the less
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repairpal.com > Problems > Buick > Park Avenue Buick Park Avenue Engine Stalling Due to Mass Air Flow/Crankshift Position Sensor Failure. This is a verified ... 1997 Buick Park Avenue- 3.8L V6160,000Visitor. Engine stalls ... car runs then stalls and won't start for thirty minutes. Upvote (36).
Buick stuttering Questions & Answers - Fixya
www.fixya.com > Forum > Tags > stuttering 94 Buick Park Avenue that stutters under a light load I have a 94 Buick Park Avenuethat ... Buick Century 97 runs rough and stutters when cold and gas applie Engine runs rough ... I have a 1994 buick lesabre it starts ok but stutters and stalls.
A lot of new parts! Have a compression test done to gauge the engine's internal condition, and go from there. If compression is good on all 6 cylinders, scan for trouble codes. The compression test may find your problem, something like an exhaust valve burned or not seating properly.
You have a MAF and MAP, The mass air flow signal varies with engine load.It is attatched to throttle body. This if it is the primary signal can cause the problem you desribe try and disconnect it and see if it idles properly. The next item you need to inspect is the MAP ,manifold air pressure this is a back up for the MAF sensor.If this sensor fails you will not accelerate correctly and stall out flooding the vehicle with fuel. This monitor the MAF and your EGR. If the EGR valve is stuck open the vehicle stumble and stall out and affect the performance of the MAF and MAP.Make sure your MAP is connected and the vacuum hose is attatch this item is located at top rear engine compartment near fuel injectors
if your engne rpm race upward when you apply gas but the car move slowly, you have transmission problem. I had this same problem when my transmission gone bad. you may need to have it services or low on transmission fluid. if not the low fluid problem, then you have transmission gears defect.
When was last "healthy" tune up? Plugs, wires, ALL filters including FUEL filter? I'd start there, and run a good fuel system cleaner w/next tank full of fuel. In winter, with fluctuating temps, condensation (water) forms in fuel tank and spark plugs don't burn fuel/water efficiently causing stumbling and premature wear on your plugs.
Do you have the idle speed turned up to keep it from dying? Because it is high. Check engine light on? Have you checked for vacuum leaks at the gasket under the throttle body? How does the car run under acceleration? You might have a worn distributor shaft.