Ok soo i have 2000 blazer zr2 4x4 about 152k miles i put in a new fuel pump a month ago. My trucks been sputtering when taking off when i open the throttle more then about a 1/4. It was also taking a while to start i had to crank for a bit before it would fire up i was also getting a check engine light for fuel pressure. So i changed the injector spider to the new multiport one. It now fires up right away and my fuel pressure is all good. But it still runs sluggish when taking off and sometimes after that. I put in a new distributor rotor and it still runs rough and i have another check engine light for a miss fire on number 6.

Any ideas? I just think its weird that the error code for the miss fire is just now coming up when its been running this way for a long time. it scares me that something went wrong with my spider installation since i just did that this morning. i have a new plug for it ill try that next.

 

souds good so far i would change the plugs and also the cam and crank sensors they will give you a code also for miss fire what was the code you got for misfire also i would check out your timing on the thing you never know it could of jumperd a tooth

 

well i changed the plug and took it around the block its still sluggish and the lights still on although it did seem to be missing less, and my light wasnt flashing like it was every now and then before. It did look like it was possibly the orginal plug in it, it was an ac plug anyways. but thats also what i just put in it. Im hoping maybe its the plug wire i just didnt want to spend that much and buy new wires just yet. Im thinking when i changed the plug and the wires got jiggled a bit maybe thats why it was running just slightly better. ill have to look into the sensors.

sorry not sure what the code was i want to say like 90304 or something like that. ill run it back in tomorrow and check again.