I have a 2003 ford ranger that originally only shook when I drove at around 70 mph. Over time the shaking got worse and seems to happen more often. It shakes the most when it is in park idling or when I'm at a red light. Enough to shake m whole body. The check engine light often blinks while this is going on. I recently replaced all the injectors which didn't really help the shaking it just helped a no start problem, I also just replaced all spark plugs with Motorcraft ones and the shaking seems even more constant now even after I changed the plugs. I cleared all codes which said I had multiple misfires and the check engine light started blinking again within 1 Mile after clearing codes. This has become really frustrating and costing me too much in such a shot amount of time. Any suggestions on what to check next or what the problem might be? Also when I accelerate it drives okay up till about 55 mph the it shakes bad and if I lt of the gas it goes back to normal but when I accelerate again it continues to do this unless I go above 65 or below 50. Thanks for reading I would really appreciate any help.

 

We should find out why the engine is running so rich and causing the check engine lamp to blink it's warning.

One look at the spark plugs would tell us how bad the condition is.

 

A code scan will reveal which cylinders could be misfiring and could give you some direction. . Fuel trims will reveal lean or rich conditions.

 

We already know it is running rich, the idea is to find out why.

 

Here you go again assuming too much fuel is causing a misfire.. Did he have a rich code? Did black smoke emit out the tail pipe? Were the plugs wet and carboned fouled? Didn't see any mention of that. It's time you put your six shooter back in your holster.

 

Please , check as to why the check engine light flashes, you might like the answer.