3.3 Engine Stalls when slowing on highway

I have a 95 Grand Caravan with the 3.3 engine. I have had the engine stall several times while driving on the highway and slowing down for slow traffic. Each time it will start again after waiting for 15-30
minutes. Several times it has happened when approaching slow traffic in Chicago. Not a good place to have a vehicle stall. It only happens about once a year but at the worst times. It seems that high outdoor temperatures increase the occurances. Last week while traveling it happened again while we were pulling a small trailer loaded with camping supplies. This time however it stalled 3-4 times while driving thru Chicago on I80 in the construction areas. After reaching our destination we had a local small town garage check the van. It needed a tune-up so they changed all filters, plugs & plug wires. They also changed the crankshaft sensor and MAP sensor. Their initial installation of the Crankshaft sensor must not have been adjusted properly because it still wouldn't run right after it warmed up. Readjusting it seemed to make all work OK. On our way home it stalled one time when coming upon slow traffic near an accident, but it started up right away again. One time when going up a longer incline the tranny shifted down into 2nd and there were several hesitations. After shifting back up it ran fine. After arriving at home I went to start the van about 10 minutes later and it didn't start very well. Lot of sputtering until it cleared out and ran OK again. The error codes that I have now are 12, 14, & 32. Can anyone clearify what code 14 & 32 indicate. Also, the Check Engine light still comes on after driving 5 -10 miles. Fuel pump was also checked. 75PSI dead head, & 32 psi fuel pressure running. Anyone have any suggestions on what to check next?
Don
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a.. 12 Battery or computer recently disconnected a.. 14* MAP sensor voltage below .16V or over 4.96V a.. 32 (1984 only) power loss/limited lamp or circuit a.. 32 EGR gases not working (1988) - check vacuum, valve a.. 32 (1990-92, all but Turbo) computer didn't see change in air/'fuel ratio when EGR activated - check valve, vacuum lines, and EGR electrical

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We have had this problem before in our family with both a 1996 Voyager and a 1997 Caravan, both with the 3.3L engine. It first happened on the Voyager when it was still under warranty. I had it in to several different dealers before I found one that new the trick to fix it: Clean the throttle body valve in the air intake system. Ever since the dealer told me what they did, I've been doing it myself on both of our cars periodically when the stalling comes back. Just remove the plastic box that sits on top of the air filter box, and remove the flexible air hose to the throttle body. Tiny bits of dirt and gum that get past the air cleaner tends to accumulate on the butterfly plate and the housing right where they meet when the your foot is off the accelerator. It doesn't take very much dirt to starve the engine of air, which causes the stalling. The dirt comes off pretty well with carburetor cleaners, although I've found that rubbing it off with a clean & dust-free cloth soaked with a little cleaner is much more effective than just spraying. Wipe both sides and the edge of the butterfly plate and the housing until you no longer see the dirt coming off on the cloth. You may want to check that the cleaner is safe for the oxygen sensor if you end up spraying some in. This cures the stalling problem every time!
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