to start. i ws getting a cut out( a sort of pulse) and loss of power,, at 72-74 mph.. then the check engine light lights up..checked the codes ..yup 4433.. so i pulled the relay, instaled a new one, cleared the code.. drove the car..(early 1990 coupe, can of snakes headers ) got up to speed yup.. smae soght pulse and check engine light.. got a relay off a freinds car( knowing that on works well)instaled it.. got of to speed... pulse, check engine light...so i thought.. hum.. mabey the fuel pupm is working way to hard..i looked at the fuel filter, it looked old.. so i changed that.. speed.. same thing agian..took it to a local shop here in davis, to get the codes cleared...long story here, so i won't get into it, but i am not going back.. lets just say, the shop owner, told me it was illegle to go above 70 mph here in cal.i work at a car dealership, and i would never be that rude to a customer, but he was more than happy to take my money for not fixing the codes( i have now leanerd how to clear the codes myself now)but what could be causing the problem..i did have an injector code, but i have the 034 adapters in my car now, and 5 new injectors form a 3.8 supercharged pontiac,, 29 lbs/hr. and a really cool fogging pattern..i now get 28-30 mpg at 70 mph now, but i still get that bloddie light at 74 ish...maybe the fuel pum is going out , causeing this light to turn on? thanks

 

sorry for the spelling, new keyboard...( old fashion type,, my spit keyboard, took a dive)

 

check your O2 sensor, just replace it. Sometimes it tests fine, but kicks out under stress. Hard to detect. So if you haven't done it in a while I would suggest that.

 

https://www.audiworld.com/forums/sho....php?t=2773984 refer to my last post on this thread before you just replace the o2 sensor no point in throwing money at it before ya atleast try n test it. Other then that I'm not terribly sure, could also be a short in your electrical system though that's a little more unlikely, I think. And before you pull codes your running it up to temp and over 3000 rpm a good bit then leaving it running after you park while pulling codes right?