Again, more weird problems..
last time I posted a question, it was my steering box + PS pump, then brakes ect...
I don't know if I will see the end of that..
This time, I have some ignition or fuel problem.
During the holidays, I drove down to Florida. Nothing to say, I did the trip from Montreal to Daytona without any snag.
It's when I came back that I started to see some problems. It started on I95 near Jacksonville FL.
I noticed that when I was on cruise control, or at 70 miles-h, everything was fine, but when I was going down hill, or releasing the gas pedal, the engine started to hesitate, to miss.
And it became worst and worst.
If I accelerated quickly, pedal to the floor, the engine was running perfectly, but as soon I was decelerating, the engine was missing fire or something like that.
My worst nightmare was the toll plaza... the stop and go was a big problem.
So to avoid traffic, I drove 30 hours in a row, coming back by night, my girl friend sleeping beside of me...
When I crossed the border, in my country, it became so bad that I was sure that the engine would die in the middle of the highway.
Finaly, the engine died in my driveway!
Two days later, I took the plugs out, replaced them by the original one that I bought at the dealer.
I changed the plug wires.. the truck restarted quickly, but is still missing in the middle range.
On idle, it's perfect, if I floor the pedal, it runs perfectly too, but if I just put a little pressure on the pedal, to hold a fast idle or a 2000 RPM, it runs pretty roughly.
I changed the ignition coil, the fuel filter, cleaned the mass air flow sensor, replaced the cap and rotor.
Checked the fuel pressure, got 55 PSI..so it looks OK to me.
I don't think that the fuel pump is the cause of the problem, otherwise, I will get the symptom at any RPM..right?
I also went to GM and bought a new pick-up coil, (the sensor in T shape mounted under the rotor).
I don't have any codes...The engine check light is OFF.
At the worst condition, on the way back, I noticed that the check light was flashing (missfire detected)
But the light is now OFF.
I'm clueless now!