3.9 MPEFI Flat Spot
I've just bought a 5 speed EA S-pac with MPEFI 3.9 engine. Never owned a six before just V8's, so I've got no experience to draw on. Can anyone suggest a likely cause for a flat spot just off idle? If I open the throttle very very slowly there is no problem. If I open it very fast, again no problem. If I drive normally, the engine tries to die when I take off from a standing start. I can get around the problem by keeping revs above about 1500 when I take off from a standing start, or alternatively by letting the engine bog down then give it full gas until it gets past the flat spot. The engine runs well above about 1500, and idles perfectly. It's just a problem at part throttle. Any ideas??
Thanks in advance for any suggestions.