89 ford f150 4 WD dual tanks acts like it's starving for gas,no power, back firing in the motor,with clutch mashed and giving gas rpms go to 3 n fall back to 1 can someone please diagnose my problem?

Asked by Mar 25, 2015 at 04:26 AM about the 1989 Ford F-150 S Standard Cab 4WD LB

Question type: Maintenance & Repair

Been in shop four times
now n still isn't fixed.
also has loud whistle
from a part underneath
truck can see it from
under driver door.

2 Answers

80

Vacuum lines maybe

110

Check your timing, timing chain! Check or replace fuel filter and fuel pump! Is it carb or fuel inj.?

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