94 mustang drivability issue

boss302whr

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Hey new to this forum I have had my mustang for a few years finally got a steady job ready for some mods.

Mods so far:
CAI-UPR
Long tube headers-BBK
Off road x-pipe-BBK
SLP loud mouth resonators
Hurst short throw shifter
Smog delete
MSD wires
MSD coil
MSD cap & Rotor


After I put my exhaust on I had an issue when starting. When I start it it will rev high(I know it's in open loop so it will rev high, it's higher the that). Sometimes it will even die right after I start it. When I'm driving in in any gear at about any speed it will pop through the exhaust and if I go wide open throttle it won't do it anymore. So someone time me it could be an O2 sensor, I agreed because I had trouble getting my old O2 sensor out and thought I might have damaged it and replaced it.

Any help would be great. Thanks



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the5.ohh

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Well the high idle could be your IAC crapping out. The car is 20 years old, replacing the O2 sensors would help a bit, even if they're fine right now. As for the delay and popping through the exhaust, I had the same problem. Car felt like it wouldn't move at all, and felt the popping going through the exhaust. Turned out to be a bad o-ring on one of the injectors, so check your injectors
 

B.mad

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I dont know if it helps or if it works the same way but i had a similar issue on my '72. And it turned out that a spark plug wire was coming off. Same thing, power loss, and poping through the exhaust, however it didnt rev high or and i didnt WOT so i dont know if it would of solved it, but its worth a check just in case
 

RSB95

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Could be o2 sensors but Check those wires, could have one arcing off the headers, happened to me, car was running crappy and I poped the hood at night and I could see the arcing
 

naes.sdrawos

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i would check plugs, wires, gas integrity, clean throttle body, check iac for carbon, fuel pressure during good operation compared to acting up,

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boss302whr

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I checked plugs, looked ok but I replaced anyway, my plug wires are good not touching the headers, I've been using 93 octane, I've cleaned my throttle body. All with no change


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