89 SHO Engine Problems

[89SHO X2]

K, My car ran great for a while and started hesitating on acceleration(jump, jump, jump) then it would open up and be fine. It has been intermintent even acts up at full throttle sometimes. Sometimes it runs fine. Have another car I just got it has a good engine. So I swaped the coilpack and maf sensor and DIS out of it. It still ran the same. Now it fire and runs for a few and dies. When I hit the throttle it has a dead spot and dies trying to open it up. It pops also when it is opened up. It was running fairly good yesterday now not so good. What is the most likely cause. Don't want to waste time pulling what I really may not need.
I have a cold air intake, with flow meter housing removed, Magnaflow exhaust , and a JET Chip. It ran like this before the Chip and flow meter tinkering.:wave:

 

[hawkeye18]

sounds like a fuel pump going out. Swap that biznatch!

 

[89SHO X2]

Thanks, thought so but I ran a pressure test on it the other day and it held at 30-38 on acceleration

 

[89SHO X2]

It may be. started it idles up smooth and drops to about 950 for a few then struggles to stay running then dies. I can also start it and rev. it up smoothly then it bogs down and dies. Fuel pump can be heard when the key is turned on it is kinda loud and very noticable. Preassure a week ago was 30 at idle no varyation and 38 at higher rpms.

 

[BlackonBlack89]

plugs and wires is wat I would try next.

check engine light?? could also be a bad 02 sensor.

 

[89SHO X2]

Check engine light has been on since I bought the car last summer. I have messed with the car and had it running like a top for a long time then it started cutting out here and there on accel. and slowly got worse and then kind of went away but now this.

 

[BlackonBlack89]

O2's is my bet

 

[SolidState]

uh, pull the codes?

 

[SHO_DOODmorrris]

yeha i bet o2s... quick change. go to the JY and grap a couple or go buy one from your parts store and swapem out.

 

[Phoenix]

uh, pull the codes?

Best advice yet : http://www.shophoenixproject.com/eec/eec.htm

 

[89SHO X2]

Thanks for all your guy's input. I swaped out MAF with my other car and has no more problems. Ran code and came up with code:66 MAF voltage below minimum.

 

[hawkeye18]

well there ya go. Things are so much easier when you pull the codes...