I already did a search that didn't answer this question. When decelerating I will sometimes get a Check Eng Light. I put on the code reader and got a 327 during KOEO. Says EGR position Sensor voltage. Is it a voltage problem to the sensor, or from the sensor? Is there a voltage or resistance check i can do at the connector? This could kinda explain the "gutlessness" occasionally other than just being a 5.0 with 103,000 miles.

 

Code 327 - EVP was below minimum voltage. Troubleshoot by first checking the wiring harness connection at the EVP (EGR Valve Position) sensor. If all appears to be solid, disconnect the EVP at the harness and with the key ON and engine OFF verify that you have at least +4.75 VDC at the BROWN/WHITE wire in the harness connector. (barring damage to the harness this should be fine or you would have a LOT more issues). You are verifying the ECM's +5VDC reference voltage (VREF) that is sent to almost every sensor in the truck.

Assuming that checks out, leave the EVP electrical connection open and disconnect the vacuum supply line to the EGR valve. Manually apply and release vacuum to the EGR valve three or four times in quick succession. (This should get a stuck EGR valve moving again). If you cannot hear the EGR valve snapping shut, it may be time to replace the valve. If you can hear it or you want to try before replacing it, reconnect the vacuum supply and the EVP connector. Run the truck until it reaches operating temperature and re-test using the KOEO. If Code 327 returns, replace the EVP sensor. Run the test again after replacing the EVP. If Code 327 returns again, replace the EGR valve.

Note: If you want to perform a resistance test on the EVP sensor, leave the Key On Engine Off and with the EVP connected, probe (stick a pin or sewing needle through the insulation and into the wire) the BROWN/LT. GREEN wire and take a reading between it and negative (ground). If the voltage reading is BELOW +0.29 VDC replace the EVP.