my truck (approx 200k) stutters/cuts out under load about 3k+ but drives beautifully the rest of the time. it is actually intermittent took it for a hard drive the other day and was getting it to redline around town but I notice when I have a little less fuel in the tank (close to half) it will stutter especially if I approach high rpms slowly rather than just hitting the hammer you know? just loses power but never dies completely. if my timing belt is 2+ times over due could it be the issue? I don't want to start throwing parts at it I've been through that before. I can hear a high pitched whine that is for sure coming from the gas tank I already changed my plugs and fuel filter how do you diagnose a bad fuel pump? when I first got it, it kept dying when I got close to an empty tank (I had a 99 I would drive with the gas light on for a day or two cause I knew I had 15 or so litres and never had any issues) so I thought okay never let this one get below half and the problem went away but it happened again and I had over a half tank in there so now im thinking pump? lots of threads on this sputtering issue and everyones solution seems to be different so thought I would share my symptoms. I NEVER GET A CHECK ENGINE LIGHT WTF.
Thank you in advance