to fix this i think we will need to replace a couple of things..first,,replace the ignition module,these can do this with heat sometimes,and,when they do this,testing it will not help you..so replace this first,,,if you still have the problem,the pick-up coil may be bad[either of these can do this with heat],,if this is the case,you may want to replace the compete distributer with a new rebuilt unit,sense the distributer will need to come out and apart to replace the pick -up....i am fairly sure your problem is in one of this parts,but,sense it is intermediate,testing them isn't going to help........what is going on,is,t sounds as if it is loosing injector pulse,,,even though it may have a spark on the plugs,the injectors may not be firring......
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Typical Distributor Components
yes,,it is common to get a bad new one..
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