Hey guys. This is my first post but I have been a member for a while. I am having a big problem with my Cobra and I am at the point of pulling my hair out. The car is an 04 Mystichrome with 26k miles. I am having some driveablitity issues. The cars idles great and I can drive it as long as I do not get into boost. If I am just cruising the car does awesome but as soon as I do any type of tip in or acceleration the car will just backfire and fall on its face. I let out as soon as it does it but it feels like it will die if I did stay in it. It will do this at 1 pound of boost. I am stumped I use to be a Ford mechanic and I am at a loss.
LIST OF MODS:
2.8 kenne bell with low vacuum bypass valve running 25lbs boost
Comp Cam stage 3 cams with beehive springs
ARP head studs
SCT BA3000 MAF
JLT High boost intake
Glenns Performance 1000hp twin walbro pump fuel system
Fore fuel rails
80 lbs Ford inj
Magnafuel fuel regulator set at 42lbs baseline
NGK TR6 gapped at .025
AFCO Heat exchanger
Head cooling mod
Mac longtube headers, x pipe, magnaflow magnapacks
Spec 3+ clutch
Liberty input shaft
UPR tubular k member
Solid axle swap with Baseline Suspension
Strange Struts
Parts replaced since problem began:
MAF
Fuel pumps
fuel regulator
All fuel lines and filter
spark plugs
all ignition coils
TPS sensor
CAM and Crank sensor
Boost bypass valve
Had all exhaust valves and seats replaced
Tried a different shop for tuning
Quick history from when the problem started. The car ran great with just the 2.8 kb. I then added the comp cams and fuel system. I removed the motor and had Marvin Bridge from Bridge Racing degree the cams for me. I towed the car to Kurgan Motorsports where it did awesome on the dyno for 6 pulls. It made 710rwhp and 626ft trq. We backed the car out to test drive and the problem started as soon as we pulled out of the parking lot. He kept the car for a month and was unable to figure it out. I picked up the car and took it to BB&t Racing and they told me my heads were bad so I took the motor back out and had the heads rebuilt but the problem is still there. I am just tired of throwing money away at it. this has been going on since last summer and I need it ready For Bowling Green in October. Any help or advice would be greatly appreciated.
LIST OF MODS:
2.8 kenne bell with low vacuum bypass valve running 25lbs boost
Comp Cam stage 3 cams with beehive springs
ARP head studs
SCT BA3000 MAF
JLT High boost intake
Glenns Performance 1000hp twin walbro pump fuel system
Fore fuel rails
80 lbs Ford inj
Magnafuel fuel regulator set at 42lbs baseline
NGK TR6 gapped at .025
AFCO Heat exchanger
Head cooling mod
Mac longtube headers, x pipe, magnaflow magnapacks
Spec 3+ clutch
Liberty input shaft
UPR tubular k member
Solid axle swap with Baseline Suspension
Strange Struts
Parts replaced since problem began:
MAF
Fuel pumps
fuel regulator
All fuel lines and filter
spark plugs
all ignition coils
TPS sensor
CAM and Crank sensor
Boost bypass valve
Had all exhaust valves and seats replaced
Tried a different shop for tuning
Quick history from when the problem started. The car ran great with just the 2.8 kb. I then added the comp cams and fuel system. I removed the motor and had Marvin Bridge from Bridge Racing degree the cams for me. I towed the car to Kurgan Motorsports where it did awesome on the dyno for 6 pulls. It made 710rwhp and 626ft trq. We backed the car out to test drive and the problem started as soon as we pulled out of the parking lot. He kept the car for a month and was unable to figure it out. I picked up the car and took it to BB&t Racing and they told me my heads were bad so I took the motor back out and had the heads rebuilt but the problem is still there. I am just tired of throwing money away at it. this has been going on since last summer and I need it ready For Bowling Green in October. Any help or advice would be greatly appreciated.