I have a 1986 ford ranger 2.9 manual 4wd. Need to know what the correct 1988 ECM OEM part number for 1988 manual 2.9. I know there is a certain code you need to look for when loking for a OEM ECU. Just bought truck and someone deleted EGR valve and plug man and intake but didnt swap the computer with 1988+. Thanks for the help.