Question about Ford E-150
If the problem is more evident at idle, then you may have a vacuum problem. Test the vacuum with an hand tool gauge and see if there are leaks.
One of the most common reasons for this kind of poroblems is also a fault concerning one of the O2 sensors located on the exhaust system.
The same tool used to test vacuum can also be used to test the fuel pump, reading fuel pressure on pump outlet hose.
Check air intake, in there you have two sensors, MAF and AIT, that influence injection and can cause troubles.
To find out what the problem is, the first step is always connecting an OBD 1 code reader to car computer (PCM) to read error codes, or doing a self test following instructions here.
Here tool to test vacuum and pump: Vacuum Gauge and Fuel Pump Pressure Tester
see How to Use and Interpret a Vacuum Gauge
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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