Has it had the fuel pump rewired ?, and the fans ?.
If not then do it for safeties sake, could be running out of fuel(pressure) if pump hasn't been rewired, this will kill your engine, a number of other things like the fuel filter needing changing so do this also, unless you know it's new.
There's theads up detailing the fuel pump rewire, a easy job that can make the world of difference, so just hit the search function button.
tabetha