Ok the problem i have i can drive round town all day and no problems,but after driving along at motor way speeds for 20 minutes feels like the car is starving for fuel.What could it be?Mechanic i took it to had no idea.Have done new sparkplugs, and new fuel filter on.Could it be a fuel pump relay problem?The mechanic suggested i put it on a rolling road diagnostic machine.Any idea on the hourly cost of that??

 

No idea of the hourly rate on that. So when cruising at higher speeds it just bogs down a little if I'm not mistaken? Could be the pump but I doubt it since it only occasionally happens. How many miles on the car, engine, trans. Auto or manual trans? I'm just guessing it could be the fuel injectors going a little bad. Could be that or TPS sensor, or MAP sensor, or fuel pump, or fuel pressure reg, or VTEC components (if applicable). **** it may even be the trans (more likely if it's an auto, yet both are very unlikely). Just shoot out a little more info. Try this too, measure the resistance between the two terminals on the fuel injector, is the resistance between 10-13 ohms? If not replace any injectors with res. out of this spec. I really think it's somewhere in the fuel supply system though.