i have had my nearly stock 98 cobra for a year and 4 months now, and have been driving it for a little over a year. i didnt really give it much abuse until around 5 months ago, i dont abuse the car that often now, but when i do it doesnt feel as quick to respond as it used to. at the top end of the rev range it launches you back, but doesnt feel as fast as i want it to lower down. the only thing that the car has is a 93 octane tune, as i have a diablo predator. i havent modified the tune. now i also have a C&L intake and K&N filter combo as well which i used to use. when i originally got the intake and filter, it constantly stalled itself and seemed to drop power low down, so i stuck the higher octane tune and continued to use the more expensive fuel. it didnt make much difference so i removed the filter. when i start the car in the morning it seems to splutter slightly. the second it fires up, the revs will shoot up to 1500rpm, splutters, drops back down to around 800 then pulls back up to 1200 while it warms itself up. i changed the spark plugs just incase but it made little to no difference. my question is, does it sound like my coilpacks/ ignition leads need replacing? the car has done 85,000 miles now but was stored for a while before i bought it. every other sn95 i have driven seems to have a smoother idle, starts with the turn of a key, revs fine and generally seems smoother, no matter what the milage it has covered, i have changed the spark plugs and fuel filter, cleaned the MAF and IAC valve around 3000 miles ago, changed oil and oil filter around 1000 miles ago. i am using the stock filter i got with the car and havent changed the battery. ill get a video posted of the startup shortly, you will see what i mean. anyone have any tips or hints?