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1987 Mustang bogging down

1240 Views 3 Replies 3 Participants Last post by  87Gtstang, 
87Gtstang
I have an 87 mustang gt, has bbk shortys and h pipe, 3.73s, converted to mass air. It idles fine and will run smooth if I baby it but if I try to open it up any then it will bog down real bad, my mass air conversion was just fine for about a month, so I don't think that would be it, I checked all the wires and they seem fine. I have changed the fuel filter, and the spark plugs, I tested the fuel pressure and it's at 32 psi, I hear it's supposed to be at 38. Would 6 psi make that big of a difference or is it something else?
I just don't want to spend money on un needed parts, thanks for any help
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cindys_sn95
6 pounds doesn't sound like much but that could be your problem. you did test it with the vacuum line off?
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travisp11
Egr?

You may want to take off your EGR valve and see if it is mucked up with carbon/grime. Could also be the EGR actuator. I have a 91 GT but I am assuming that the 87 has the same EGR valve.
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87Gtstang
I tested the fuel pressure again last night, and it was reading 32, then when I took off the vacuum line from the regulator, it shot up to like 41ish. I remember this meaning that either the pump or the regulator was bad, but I don't remember which
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