Why do my RPM's jump when I press the brakes?
 

So, I'm sitting at a red light yesterday like any other day. As it turns green, I slowly hit the gas and all of a sudden, the RPM's drop down to almost 0 and then shoot back up. It felt like the car was going to completely turn off. It did this 3 times that day.

Now, every time I press on the brakes the RPM's shoot up from about 1500 to 2000. I'm just cruising, doing about 45mph and if I press the brake to slow down, the car slightly jerks and the RPM's shoot up. Any ideas?

*When I bought the car from achebee4you last year, the CEL light was on which was caused by the EGR valve being dirty. This has not been corrected yet. Could this be a reason why my max is performing this way??

check the MAF

Iacv clean it or replace it.......and no the egr wouldnt cause that.

Yes the EGR can cause it if it stuck open and its not closing which mean its leaking exshaut into the intake manifold you may get a random missfire code

u should check the MAF cuz that happened to me when i installed my short ram

Silver Bullet Your sig is too HUGE Fix It.

To the OP; you could have a number of problems.. EGR, Vac Leak, MAF, IACV.. start with the easiest first.. Clean everything up; IACV TB, MAF (be gentle),if problems persists, get some starting fluid and spray it around the intake manifold and plenum nad what not and check for a vac leak..

have you done anything to the car in recent history?

Does it do it when you press the brakes without the car moving? Given the braking relationship I would at least check the condition of the hose going to the brake booster. I would also be inclined to clamp shut the brake booster hose and see how it behaves under those conditions. Beware that it will be a lot harder to actuate the brakes without that vacume so you might consider doing it on a stretch of road where there is not a lot of traffic.

Agreed.

Do the cleaning and get EGR fixed. A lil Chevron Techron Fuel System cleaner wont hurt either lol Woot wooot :chuckle:

I recently replaced the fuel filter and this problem went away. Solution or coincidence? Hmmm