This morning I purchased a 1999 Isuzu NPR V8 350 in Ontario, CA for $6000.00. I test drove the vehicle and everything seemed just fine. I began my 6 hour drive back to Phoenix. As I increased speed upwards of 70-75mph the acceleration started to struggle. So, I kept my speed around 70-75 mph. My gas gauge was showing less than a quarter of a tank so I stopped to get fuel. As I pulled into the gas station the truck shut off! I coasted up to the gas pump but was just short. I tried starting the engine but it wouldn't start. It just gurgled and had some engine knock. After a 5 min wait I was able to start he truck and pull up to the pump. I filled the tank and got back on the highway. Things seemed to be the same as mentioned above until I was back down to about a quarter tank of fuel. My acceleration/power decreased and the engine shut off again as I exited the highway! I tried to start the truck again but no luck. After another 5 min wait I was able to start the truck again so I could pull up to the pump. I filled the tank and did some calculations. I only got 7.75 miles per gallon on one tank! That's horrible. As I began to drive again I could only get up to 50mph on the highway. Then after a short drive I began to loose acceleration/power again so I pulled over. I waited 10 minutes and tried to drive again. I only was able to drive about 8 miles at 50mph so I pulled over again and decided to have some dinner. Now I am going to go and try to drive it again after a 40 min wait. I will let you know what happens.
Could it be the fuel filter? The ERG valve? Clogged fuel lines? Exhaust flap getting stuck?
Any help you could provide would be greatly appreciated. Thank you. Marc
Saturday, September 1st, 2012 AT 2:58 AM