I have a 351m c6 auto trans. When I I take off in my truck and try putting the pedal all the way to the floor and the rpms wont go up. Its fine in first gear and second but it just bogs way down in third. I've checked for vacuum leaks and changed the modulator valve and that didnt help.
IT MAY HAVE A TEENY TINY ONE WHERE THE FUEL ENTERS THE CARB
IT IS ALSO POSSIBLE YOU MAY HAVE OTHER TUNE UP OR FUEL DELIVERY ISSUES
YOUR QUESTION SO MUCH REMINDED ME OF A 4 MILE TRIP ON THE INTERSTATE WITH MY DAD AND HIS '76 F-150/ 3-ON THE TREE/ 351 WINDSOR (A SHOT-CUT) ABOUT 8 YEARS AGO
SAME THING HAPPENED SUDDENLY
JUST TO GET BY (NOT RECOMMENDED) AND TO FINISH OUR OTHER THREE MILES AT A DECENT SPEED IN INTERSTATE TRAFFIC.I SNATCHED THE RUBBER LINE OFF AT THE CARB FILTER AND POKED THRU IT WITH A WIRE OR NAIL OR SOMETHING! (LET THE STUFF ENTER THE CARB) I WAS ABLE TO GET A NEW FILTER WITHIN 10 MILES
I INHERITED THE TRUCK IN 2009---IT'S STILL AT MAMA'S HOUSE, I TRY TO DRIVE IT AROUND THE YARD EVERY MONTH OR TWO, TILL I CAN "SUPPORT" IT. THE "POSSIBLE" DEBRIS AIN'T STOPPED IT YET!
KEEP US POSTED
March, 12, 2014 AT 8:52 AM
You have a mechanical fuel pump. Check to make sure it is producing pressure and proper volume.