Well maybe I can help you figure out your problem. My cobra made aout 550 HP at the wheels, so I know how to use up some fuel heh.
First off, tell me what you have done to your fuel system.
You have a 98 right? Which uses the return fuel system I think?
You DID change your fuel filter recently?
Next, your fuel pump, How many LPH is it? Also...your intank prefiler might be clogged..thats what leaned out my cobra(gosh damn crappy gas stations) I couldnt figure out where my fuel went..till I dropped my gas tank and removed a black brick that used to be a white prefilter. heh.
I see you have 30lb injectors? How have you showed the computer this change? Aftermarket Mass air meter? Or is it that chip..?
If your filters arnt clogged, then id bet money its the chip.
Id personally ditch the chip UNLESS its tuned ON a dyno WITH a wideband. Dont let anyone tune your car over the phone. If it was tuned on the dyno..and the tuner let you leave with a 18:1..smack him. Then once more for me.
If you want to keep the 30s, and they were calibrated in with the chip, id ditch the chip and buy a Pro-M meter with a SC calibration for 30s(the SC calibration will make you run rich), The factory computer aims for a 14.7/1 A/F.
With the rich calibration you should be good to go. Not to mention youd pick up more HP with the Pro-M.
Lastly, if you still wanted to be even safer, you could also run an FMU(once agian im assuming the 98s have return fuel systems, ill look at my wife's 98 tomarrow to be sure). Dont let people tell you FMUs are bandaids or hack jobs. They are safe, and they are tunable...though not always ideal. My car...that trapped 133MPH in the 1/4 weighing 3500#s...had an FMU.
Ok sorry for posting so much, I know i assumed a lot, but id like to help you sort out your problems. Ive modified, and help modify a few EFI fords. From turbo 2.3s to Supercharged 5.0s. And I dont like seeing people throwing money away to fix a problem if Its something ive delt with.
