88GTMustang

Okay I got all the plugs, wires, cap and rotor changed and the car is still pretty darn slow. Our rental Sentra beat it today. Sad moment I tell ya. What else could be making this thing such a dog? I know they were not super fast stock, but it still idles rough when cold and just doesn't seem to climb very fast in the rpms.

Should I change the coil? I was told they either work, or they don't.

flyinghigh2k8

changing the coil wouldn't be a bad idea. Have you tried changing your fuel filter yet??? is it an auto or 5-speed?

onebadyfz450

im in the same boat, i changed all that and still a dog, i bumped up timing and that helped some

Tony71502

Def change that fuel filter. You could even change the bladder filter on the pump inside the tank.

Have u cleaned off your MAF and checked for any codes?

50Stocker

I had the same frustration, it was a clogged mass air sensor...I hit it with CRC cleaner and it's great now. Make sure you flog that Sentra for showing up the mustang...

HACKGT350

clean the maf replace the fuel fliter and maybe even the pump check the fuel pressure. bump the timing and do a compression test

Alero99

may just be somthiung inside the engine bro... what things can go wrong internally that could cause cars to run like dick? cracked head? spun bearing **** like that

HACKGT350

oh yeah ever think of checking for a vacuum leak that will make you slow as hell and give you a ****ty idle

bikeboy587

Had the same problem as you and I chased it for 6 weeks.

#1 Clean you MAF Sensor (that was my problem I found after 6 weeks, cleaned it and then the car took off like a bat out of hell. before that my V6 mustang was walking it.) other things I changed and that you can check
#2 Fuel Filter
#3 Fuel pressure (schrader valve on fuel rail)
#4 Fuel pump
#5 coil, cap, rotor, plugs, wires
#6 Clean IAC
#7 Check for clogged cats
#8 Give it a good seafoam, esp the intake
#9 Check timing, set to 10* (stock) until out find the problem, then feel free to advance it to about 12*
#10 Check/scan for any engine codes
#11 Clean the MAF

Did I say clean the MAF? please do that! you may want to erplcae the MAF if the car does not run better after cleaning.
Go to Auto Zone and get a $5 can of MAF cleaner, take it off and hose the **** out of it

88GTMustang

It is a 5speed. I cleaned the MAF with rubbing alcohol and it certainly did run a little better, but that was before I changed the plugs and wires. I just can't believe how long it takes to build rpms. Around 3500 rpms it is fading in power.