It's either you've not soldered one of the wires properly( resistor\gtr setup), so its probably worth double checking. Other wise it could be your ecu, you could get a mod chip programmed for your setup from ebay for $45.0 & get someone to install a eprom socket into a your spare factory ecu, the ecu you've got at the moment could be dodgy?. Also check your spark plugs they could be fouled up. Triple check for air leaks or blockages. Have a look at your AFM, could do with a clean....