Question about 1988 Ford F 150

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88 F-150 stutters at speed

I have an 88F150 with 140K miles, dual tanks 4.9L 6cyl
When I am just cruising at speed, the truck sputters, and jerks, almost like having water in the gas. Under acceleration there is no issue, and the problem is lessened if I downshift.
Have replaced distributor cap and wires but no improvement.
I am thinking possible fuel pump?- but not sure if it is a problem in the tanks or the engine. I do have trouble with the fuel guage.

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Test the fuel pressure, at idle it should be around 40-44 PSI, when u jab the throttle it should go up a few pounds, but never down, if it drops u have either a clogged fuel filter or a failing fuel pump, the filter is on the frame rail driver side, the pump is inside the fuel tank, if the pump is the problem replace the filter as well, the best price for this pump or the entire pump module is a site called http://www.rockauto.com/catalog/raframecatalog.php, used them for years, call around u will see what I mean about the price.

Posted on Feb 10, 2009

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Could possible be a bad fuel pump or a bad fules filter a dirty fuel filter can cause the same effects as a quick solution try running vehicle with dry gas when u get down to a quater tank should evaperate any water and also replace that fuel filter before a good fuel pump goes bad and will cost you alot more than a filter

Posted on Feb 10, 2009

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YOUR THROTTLE POSITION SENSOR MAY BE BAD IN ONE SPOT .TAKE OFF THE WIRE CONNECTOR AND CHECK WITH ANALOG OHMMETER OPERATING THE THROTTLE LEVER VERY SLOWLY AND THE NEEDLE WILL DROP WHEN OPEN CIRCUIT OCCURES.

Posted on Jan 24, 2010

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Posted on Jan 02, 2017

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