intermittent power loss

[sho007]

HI guys, new here to the site and hope you
all can help.
Picked up a 92 5 spd SHO last summer and have
yet to drive it more then a block. Last owner couldnt fix it, so now its my shot.
Im familiar with working on cars, which helps but this one is stumping me.
Car fires right up and I let it warm up a few
minutes. Hop in to drive and power it intermittent.
It will take off fine then fall on its face..off and on.
For fun, I installed a new coil pack, cleaned the crank position sensor and checked the gap, installed a new TPS sensor (which it really felt like) and none of that stuff made a diff.
I then dropped the y pipe about an inch thinking maybe the main cat was plugged. That didnt help.
When it does this I can put the car in nuetral and try to litteraly try to rev the motor up and even then it doesnt run right and feels and sounds supressed.
Go to drive it more, and for about 20 feet, feels normal, then goes back to no power at all. Wont die but just enough power to get it off the road.
No CE lite as of yet.
My next guess would be maybe a bad fuel pump with low fuel pressure and or maybe MAF sensor.
But figure Id at least get some sort of CE lite if it was
the sensor.
Any suggestions and Im all ears.
thanks
Dg

 

[Shoemjay]

check your grounds on your fender walls and were ever else, i had a similiar problem and no sensor fixed it. It was the ground wire to the computer i guess, next to the battery fender wall. car would start and somewhat run until you gave some gas and would vibrate, it was tough to figure out cuz it only did it under load. well it fixed my problem.

 

[rubydist]

Welcome to the forum!

I recommend to always check for codes first - there may not be any, but if there are, it will quickly narrow down what is going on. shotimes.com has a good how-to on pulling codes on these cars if you need that. Just because the CE light is not on does not mean there are no codes.

The ground suggestion above is a good one, also make sure that there is a very good ground between the firewall and the intake manifold - the DIS is very tempermental about a poor ground.

Also, you should be aware that cleaning the crank position sensor will not help one that is sick - although your symptoms are not typical for a bad cps.

And, if the car has been sitting for some time, the gas is surely stale, so I suggest putting new gas in it along with some injector cleaner or some acetone for the next several tanks, since stale gas can easily gum up injectors.

 

[ryan21288]

Try unplugging the maf see if that helps.

 

[kelownadoug]

power loss

DIS module.. was my problem. took a while to find it.. does the rpm gauge act funny too? if so.. its for sure the DIS