My 1991 Audi 100 (about 150K mileage) sometimes stall when slowing down on an incline or sudden braking .Also has starting problems when engine is hot. It's OK if restart immediately after switching off but if I wait 5 minutes or so, it is difficult to start. From observation it appears to be flooding because after a 5 or 6 cranks it slowly comes back to life!! Smells of petrol when I am driving sometimes. No problem starting in the morning. Could it be the coolant temperature sensor?. Is the oil temperature sensor the same item? Really having tough time trying to figure out the fault. Hope someone can help. Thanks