chrissn2

Ok I drive a 2000 mustan gt 4.6 L. I recently put new E3 spark plugs in it and since then my car has been acting wierd. My car doesnt idol right and this morning i went to crank it and it took me 5 times it seemed like it wasnt gettng as or somethin but i have a full tank i whn it started it acted fine didnt even drop in rpms like it usall does. Thats my next peroblem i will be sittin at a red light and it will idle at around 950 rpm then it will jump to abut 1100 then it will drop to 500 rpm then it will go back to 950 rpm and it will repeat this until i take off. When i am drivin regularly it acts fine and nothing in that nature. Now here are a few aspects to throw in with this and i know what im about to say is mustang abuse but its kind of not my fault ok my intake manifold isbrok where my heater hose goes into it from the back of the engine to the firewall. The platic broke that the clamp holds the hose onto the intake manifold so it keeps coming off every now and then so i run water instead of antifreeze which is about to change because i have one ordered and on its way i was just wondering if that could be the problem but i have had this problem for a while and my car never did this. Here are some problems i think 1st do i have a vacuume leak? 2nd is it a sensor of some sort. 3rd or is it those e3 spark plugs? please help! thanks for reading this!

03BottleFedGT

1st get rid of those e3 plugs. then check your iac valve

chrissn2

Thanks you so much! wanna reccomend a type of spark plug for me?

03BottleFedGT

either motorcraft or autolight

Miketheplumber

Is there anything I should know before dropping the tank. I went through hell removing the filter...not fun. I need to crack open the tank to replace the fuel pump....any help along these lines would be more then welcomed.