Hey guys,
i need a lil help my engine light begins to blink on and off everytime i accelerate up to 75-80 mph then it stays on constant. Does anyone have any reason why that would happen.

 

No idea. Get you car scanned and find out what code is popping up. Even if the light is not active, there should be a code history of why it came on.

 

the code that is coming up is P0300

 

The blinking CEL indicates a random/multiple misfire which is what set the P0300 code. Several things can cause the misfires. Worn plugs, wires, a dirty MAF sensor or a fuel distribution problem are some common causes.

 

well I have replaced all the plugs and wires, next im gonna change all the ignition coils.

 

Coils rarely go bad. I would do more diagnostics before replacing coils. If a coil was to fail, you normally have one or two cylinders failing (not all random).

MAF, fuel pressure regulator, vacuum leak, ICM and a few others.

 

Jason is right. You coils will not all go bad at the same time. The coils in these cars don't go bad Often and if one coil set goes bad you will have a miss or no fire on 2 cylinders.
Looking from the passenger headlight into the engine compartment your firing order is;

Coil 1) Cylinders 1 & 4

Coil 2) Cylinders 2 & 5

Coil 3) Cylinders 3 & 6

Each coil fires both cylinders at the same time, for a more complete burn.
So if you have A bad Coil you will have a Miss or No fire on Both Cylinders associated with that coil.
When my Coil 2 went, I took the car to Pepboy's and they did a check with there BIG Expensive Diagnostic Computer. They were able got get the computer which cylinders were misfiring, 2 & 5 for me.
Although VERY VERY Very rare, if you are having a misfire on all cylinders, it's either your Ign. Module or you PCM.
With mine, my RPMs would shoot up when I stepped on the gas but the engine would bog down and I would have NO POWER. Took a Long time just to get to 50 MPH.

Coils are $50 each, About! Unless you are an Electronics Geek like me, All you really need to replace is the Bad Coil!

 

Random misfires like that can be fuel related. When was your last fuel filter? Did you notice this after a fill-up? Could be a tank of bad gas.

 

thanks for all the replies guys, what i am going to do is spend some money and take it to be put on a real diagnostic machine from there. I bought the car in may of this year it only had 135k miles on it i paid 4k for the car clean as hell and i have been wanting one for a while. i have put a bit of money in it. i have replaced

RADIATOR
TEMPERATURE CONTROL SENSOR
WATER PUMP
THEROMOSTAT
WIRES/PLUGS
SO I JUST WANT IT TO RUN RIGHT BEFORE I TURN IT INTO A PROJECT CAR.
I WILL LOOK INTO A FUEL FILTER THIS WKEND