Hello I'm new here looking for help,2000 caravan 3.3 flex fuel. 4spd stumbles and sometimes busks,no SES light on or even a flash when it happens,only does it on heavy acceleration or going to pass and not all the time,I can tell by the way it has to be motor related,idles and starts great has not stalled,just to be sure I've changed in and out speed sensors,fluid and filter, sila. pack,platinum pluged,wires,air filter,no metal in trans. pan at at all,next steps I'm taking are TB off cleang and changing TPS along with fuel filter,battery alt. and battery terminal chanded last 2mo.,I've seen post about a pigtail harness and also ground strap for trans. that could cause these problems but not sure where to find them,anyone with suggestions please let me know,thanks for taking time to read and help.