DOVER, Del. (AP)Kyle Busch couldnt resist taking a poke at the driver who replaced him at Hendrick Motorsports.

Buschs career has skyrocketed since signing with Joe Gibbs Racing, while Dale Earnhardt Jr.s sagging career has hit an all-time low. On Wednesday night, team owner Rick Hendrick had enough, firing Earnhardts longtime crew chief Tony Eury Jr. in an attempt to salvage the season.

Its never Junior. Its always the crew chief, said Busch, who wonders when fans might finally blame NASCARs most popular driver for his slumping start.

Earnhardt is 19th in points and coming off a season-worst 40th-place finish at Lowes Motor Speedway.

Eventually, Im going to be the one that has to answer about how much I lived up to my fathers name, Earnhardt said Friday at Dover International Speedway.

And hes ready to take the heat from anyone who wants to take shotseven Busch.

Hes always had a chip on his shoulder for me, Earnhardt said. I expect any opportunity to throw a jab at me, hell do it. Thats just his personality.

Earnhardt understands that without Eury Jr. around to deflect criticism, its up to him to find the spark that will jolt the No. 88 into contention for the Chase for the championship.

Earnhardt couldnt say why the pairing with his cousin flopped, but he pointed the finger for the back-of-the-pack finishes at himself.

I take full responsibility for making some mistakes along the way, especially this year, he said. I would say I havent been on my game. I shoulder any amount of responsibility thats necessary and everybody feels is fair.

Team manager Brian Whitesell will call the shots this weekend at Dover. Next week, Lance McGrew, who has previous crew chief experience in the Cup series with former Hendrick driver Brian Vickers, will take over on an interim basis at Pocono Raceway.

McGrew, who was working with Brad Keselowski this weekend, said making the Chase for the championship is still the goal this season.

Earnhardt finished last in the 12-driver Chase field in 2008. This season, Earnhardt is a whopping 203 points out of the 12th place cutoff for the Chase. Hes had three top-10 finishes and six finishes of 27th or worse.

Hendrick driver Jimmie Johnson said Eury will work with his team next week on road course testing because crew chief Chad Knaus will be unavailable.

Earnhardt and Eury spent Tuesday and Wednesday testing on the road course at Virginia International Raceway. Hendrick told them he was splitting them up when they returned Wednesday evening.

Busch said the Eury-Earnhardt combination hasnt been clicking since last summer.

Youve got to make the most popular driver in the sport competitive, so you got to do what you got to do, Busch said. Hes the one who brought that crew chief on. Hes the one who pulled so hard to bring Eury in.

Busch has 11 Cup wins for JGR since the start of the 2008 season. Eury Jr. and Earnhardt left Dale Earnhardt Inc. last season for Hendrick Motorsports. Despite driving for NASCARs top team, they had just one win in 48 races.

Earnhardt is well behind teammates Jeff Gordon (first), Johnson (fourth) and Mark Martin (12th) in the points standings.

Theres no substantial differences in how the No. 88 is being run versus the other teams, Whitesell said. I do feel the personalities and the fact of them being family may have been a factor.

Earnhardt said he has not talked with Eury since Hendrick made the move.

Whitesell and Earnhardt got their first crack at working together on the No. 88 during qualifying later Friday. Earnhardt turned a lap of 154.799 mph and qualified 22nd, his best start since Talladega.

I feel his talent is exactly where he needs to be, Whitesell said.

Keselowski, the rookie Talladega winner, ran a lap of 152.265 and failed to qualify.

sounds to me that Lil' Shrub still has hard feelings about being replaced by Jr.   He has outperfomed Jr. the last year and a half, but then again, he has outperform just about every driver during that time frame.   Like Jr. said in a roundabout way, he's jealous of the attention and resents Jr. for that and that alone.