[Argeo]

Hi, looking for suggestions on a cold start problem. Here is what happens when I try to start. First, it takes about 4 or five tries to get the motor to stay running. When I do eventually get the car to run, it feels like it not running on all cylinders, the engine putters at about 500 rpm very quietly, then with a little help from the gas pedal I get the RPM's to rise up to the 1500 - 2000 rpm range. The reaction in not instant when I put my foot on the gas, it seems to take a few seconds for the RPM's to shoot up. I then back off on the gas lowering the RPM to 1000. As this point, the car most often backfires out of the pipe as it does when it is at 500 rpm's. Occasionally I would hear the pop off valve opening during this start up process, though I think I fixed this by riching the system a bit through the Warm up regulator (WUR). After the car finally settles down at 1000, the RPM's do not bounce around on deceleration which I guess happens when the car is running to rich. When the car is warm it runs great, starts great. I have changed the plugs, the fuel filter, air filter and tinkered with the WUR and the air flow plate height.

Could it be fuel pump or sparkplug wire related? This problem has plagued my car the whole 2.5 yrs I have owned. Any suggestions appreciated. Thanks in advance.