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check to make sure the power brake booster is not leaking, do this by starting the van and just let it idle in park and push the brake pedal if the engine stalls or surges or you hear a sucking noise under the dash then replace the power brake booster if there is none of these systems then replace the idle control motor. GOOD LUCK
Here is the firing order for the 1994 Chevrolet Lumina APV Van with a 3.1 Liter engine with a distributor, and the 3.8 liter engine had the coil packs, and let me know if you need any help to understand this diagram, or if you require any further assistance.
when you say car lost power bought a new battery.sound like alternator not charging battery.with car running your voltage at battery should be 13.5 volts or 14.5 volts it not alternators need replacing.have garage replace alternator if faulty because 1993 to 1994 cars if you disconnect battery car would lose memory causing car not to idle.the car will stall out at a stop light or stop sign whole lot.it would relearn itself but the stalling out dangerous around a lot of traffic.
When's the lst time a major tune up was complete? You may just need some maintenance. When I say major I mean the following Spark plugs, wires, air filter, fuel filter, pcv vlave, check the EGR valve and replace if needed, and inspect/replace drivebelt(if needed). I had an EGR clog on mine and it would lose alot of power, sometimes stall. Also check that your fuel injectors are working proply. You should have a nice cone spray of fuel coming out. You will also want to make sure that your spark plugs are correctly gapped. Your local auto supply store should be able to tell you the correct gap.
Hope this helps.