Question about 1997 Ford Mustang Cobra

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1997 Ford Mustang GT. Spits and sputters. Replaced fuel filter and ran fine for a day(350miles). Spits and sputters again. Fuel pressure 32 at idle, 36 with ignition on no idle. 42 with vacumm line off regulator. Pinched return hose and pressure rose sharply with vacumm. Pinched again w/o vacumm no rise in pressure. Dies off at 4000k spits and sputters to 3500, clears then dies off at 4000K+. What could it be?

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Check for a vacuum leak or poor vacuum regulation.

Also, check the fuel filter again. You may have somehow picked up a load of sediment in the fuel and the new filter is already clogged. If you have a way to siphon a sample of fuel from the bottom of the tank you may see this in the sample (perhaps you can get useful information by looking at the fuel from the inlet line to the filter).

A leaky fuel return valve in the regulator could be dropping the pressure more than it should.

Worst case would probably be a bad fuel pump that is too worn to maintain adequate fuel pressure.

Posted on Jul 03, 2017

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Did you do any tune-up?wires? coils?

Posted on Jul 03, 2017

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