Hi again, RamblinMan2450 here, I'm like 99% sure this is correct. 
It sounds right to me, so... Have fun, the intro is fun to play. :)

Legend:
h= hammer on
/= slide up
\= slide down
p= pull off

Intro:

E:------------------------------|
B:--0h2/5\2p0---h2--0h2/5/7-----|
G:--0h2/5\2p0---h2--0h2/5/7---6-|
D:--0h2/5\2p0---h2--0h2/5/7---7-|
A:----------------------------7-|
X:------------------------------| (Don't hit the low E, it'll sound bad. 
Mute it with your thumb 

-In other words. Hammer on the A chord, slide to the 5th fret, 
back down to 2 and pull off.
Then Hammer on the A chord, slide to the 5th fret,
then to 7th, and then play an E at the 7th fret. 

Play this through the verses.

Verse:

I was born by a fire in a cold dark cave
In the age of the dinosaur
When a caveman caught his cavewoman 
Loving on the missing link next door
There was crying and screaming and
War drums beating and a wave of violence
None of them folks survived but me
And I've been hanging around ever since

Chorus:
   A                     G
'Cause I'm a heartache never see me coming 
 D                         A
I'll always take you by surprise
 A                 G
I'm a heartache hungry and hunting 
 D                    A
For someone I can eat alive
E                                               D      G
By the time you know I'm on you buddy it's too late
A       G   D (When he sings "Heartache" share the word with those chords)
I'm a heartache

Verse: (Again, play the intro through the verse)
I watched you taking off tonight 
And I knew where you were headed to
I saw that sweet young thing
You met at that dirty old motel room
I'm gnawing on your pretty little wife
Waiting up for you at home
And you don't even know it but I'm just saving you for later
When I can get you all alone

Chorus:
   A                     G
'Cause I'm a heartache never see me coming 
 D                         A
I'll always take you by surprise
 A                 G
I'm a heartache hungry and hunting 
 D                    A
For someone I can eat alive
E                                               D      G
By the time you know I'm on you buddy it's too late
A       G   D 
I'm a heartache

Solo:

E:---------------------|
B:---------------------|
G:---------------------|
D:-0h2/7--0h7p0-7-11b12|
A:---------------------|
E:---------------------|

'Cause I'm a heartache never see me coming 
 D                         A
I'll always take you by surprise
 A                 G
I'm a heartache hungry and hunting 
 D                    A
For someone I can eat alive
E                                               D      G
By the time you know I'm on you buddy it's too late
A       G   D (When he sings "Heartache" share the word with those chords)
I'm a heartache}x3

Don't strum this, but play around with the intro, just pickin'. It's the same 
rythmn as the regular intro; just picking.

From Antony and Ceopatra
Samson and Delilah
To Jackie and JKK
Elvis and Priscilla
Charles and Diana
I'd say I've had some pretty good days
You may not believe it
But you and me son
We're about to have some real fun
'Cause I'm coming I'm coming... 

-That's the acoustic part, I even threw in some electric for you 
with that solo, but no more, hehe. 
I would tab the ending, but, I don't have an electric.
Contact me at RamblinMan1025@gmail.com 
Or, visit my profile, RamblinMan2450