Regardless of speed my engine cuts out when I hit a bump.(70mph on the highway or 20 mph through the neighborhood) Also have an intermintant problem of stalling when I turn a corner to the left. Any ideas?

 

Loose wire somewhere?

 

Have check all of the obvious places, sparkplug wires, coils, all vacuum lines, nothing is lose that I can see. The check engine has not come on yet so I'm at a loss as where to start. Could it possibly have something to with the DPFE sensor, or the EGR valve, or regulator? I checked the DPFE sensor plug I have 5volts from the plug but I don't have any resistance across the two leads in the sensor. Is this right?

 

You have a bad wire connection somewhere in a wiring loom.
I had same problem on an 84 LTD 302 engine. Hit a bump and engine would stumble.
I found mine by running the PCM test in a continuous diagnostic mode (wiggle test in older EEC IV).
In that mode, the tester wiggles wiring harnesses and connection points. If the PCM sees a momentary sensor fault, it kills the engine as an alert. My trouble was in a main wiring harness that crossed the firewall. At one point, about 5-6 leads that supplied 5VDC to the sensors were crimped together with a small ring connector. The ring connector was loose, so I was getting a momentary loss of sensor battery supply to almost all the engine sensors that used that supply. The test pointed me to the general location of the fault, but I had to cut open the wiring loom to find the exact cause.

Since your engine cuts out easily, I would suggest you start manipulating every wiring harness/ connector you can get your hands on till you locate the one that is the cause of your trouble.

 

it sounds like a bad ground that keeps making it cut out check the engine ground to the frame had this problem in an old 64 malibu hope it helps

 

check the ignition switch

wiggle the key while engine is running and in gear

tap lightly on the key with engine in drive

 

I had a 87 that would cut out on parking lot speed bumps and deep cross gutters. It was a faulty fuel pump shutoff switch. They are designed to shut off the electric fuel pump after a crash but mine would just shut off the pump for 1-2 seconds after a rough bump then come back on. Good luck.