Sorry sorry man this thing is just one problem I cannot Trace down and I'm panicking trying to fix my truck thanks for you guys help though

 

Forgot forgot to mention now that thinking about this as much that the exhaust leak I have is right before the upstream O2 sensor that could be causing this issue 🤔

 

Erm, the sensor is just that. The PCM sends a signal down one wire, (5 volts) it is modified by the sensor, (variable resistance by temp) and returned to the PCM. PCM uses that value to modify how much fuel it feeds the engine. In colder temps, you need more fuel to get a burnable mixture. If what the PCM thinks engine temp is, is dramatically different than what the actual temp is.... you run into problems. Being in florida, it is likely well above freezing there. (yes, I am jealous, it's snowing here..... pretty seriously at that.....) if the PCM thinks the engine is extremely cold, it will positively DUMP fuel, trying to get a burnable mixture. If it ISN'T that stupid cold out, the engine will flood out in less than a second.

If I remember right, your truck is one of the older ones, that has TWO temp sensor. A one wire sensor for the gauge in the dash, usually next to the outlet for the heater hose on the intake manifold, and a second sensor, next to the thermostat housing, which is the two-wire sensor the PCM uses. Verify both are there, plugged in, and actually work right. The one wire sensor is easy, if your temp gauge reflects some semblance of engine temp, it's all good, gotta plug in with a scanner to see what the two wire sensor is telling the PCM.

 

Correct correct I have the second gen it's a 99 sport 5.9 l and I have what I believe is the two wire sensor that is on the front of the intake plenum next to where the heater hose plugs in I just replaced that sensor and have seen a fluctuation in the gauge on the dash as far as temp reading showing me that it is working the engine is not overheating and it has been relatively cold lately but not too bad so I'm happy to say that I'm leaning more towards the O2 sensor being faulty because of the exhaust leak the current way the truck is the previous owner ran straight duels off of the headers meaning all I have is a down tubes from each header coming down next to each other like normal but there is no cat it was just straight two and a half inch pipe all the way to the back I put in a x-pipe that I modified and put a O2 sensor for the upstream register in and didn't worry about the downstream O2 sensor because it was in a tube on its own seem like it was fine my exhaust leak is right at the beginning of the x-pipe where the upstream O2 sensor is made but thanks for all the input man that was a really knowledgeable answer took me a minute to read 💪👩‍🔧

 

PCM doesn't start paying attention to the O2 sensors for a couple minutes after cold start. If it runs good for two minutes, then starts screwing up, could be the O2.....

 

Just just did a temporary repair on the exhaust leaks to see if this is the issue thanks for all the advice bud 💪