i,m working on a 1991 caravan 3.0 engine it stalls alot when stopping

Hello, not much advice to provide with no data or information or insight as to what's been checked. You'll need to get some professional testing for the engine performance. Something isn't working out - fuel, air, ignition spark, emissions, engine timing or compression -- testing is needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops